Performance Tool 3-Pc 3/8" Drive Large Metric Hex Bit Socket Set (W86023) is a specialized 3-piece metric hex bit socket set designed for large internal hex fasteners commonly found in automotive, industrial, drivetrain, suspension, and fluid service applications. This set includes 12mm, 14mm, and 17mm hex bit sockets, providing coverage for larger metric Allen-style bolts and plugs that are often not included in standard socket sets. This socket set is designed for use with 3/8-inch drive ratchets, breaker bars, torque wrenches, extensions, and compatible drive accessories. The 3/8-inch drive format provides a practical balance of access and torque capability, making the set suitable for confined work areas while still offering enough strength for larger fasteners. Each socket is constructed from chrome vanadium steel and heat treated for hardness, strength, and resistance to deformation. The precision-machined hex bits help seat securely into compatible fasteners, reducing the risk of slipping, rounding, or stripping during removal and installation. These sockets are useful for transmission drain plugs, differential plugs, oil pan plugs, suspension fasteners, drivetrain components, and industrial machinery hardware. Key Features and Benefits: Large metric size coverage: Includes 12mm, 14mm, and 17mm hex bit sockets for larger internal hex fasteners. 3/8-inch drive compatibility: Works with standard 3/8-inch drive ratchets, breaker bars, torque wrenches, and extensions. Chrome vanadium steel: Provides strength, durability, and resistance to mechanical fatigue. Heat-treated bits: Hardened hex surfaces help resist twisting, rounding, and wear during heavy use. Precision-machined fit: Helps ensure full fastener engagement for safer torque transfer. Automotive service utility: Suitable for transmission, differential, oil pan, suspension, and drivetrain service tasks. Compact 3-piece set: Keeps specialized large metric sizes organized and easy to access. Reduces fastener damage: Correct hex sizing helps prevent stripped plugs and damaged internal hex heads. Specifications: Brand: Performance Tool Product Name: Performance Tool 3-Pc 3/8" Drive Large Metric Hex Bit Socket Set Model: W86023 Product Type: Large metric hex bit socket set Capacity: 3-piece large metric hex bit socket set with 12mm, 14mm, and 17mm sizes Drive Size: 3/8 inch Measurement System: Metric Included Sizes: 12mm, 14mm, and 17mm Material: Chrome vanadium steel Construction: Heat-treated alloy steel Socket Type: Hex bit socket Compatible Tools: 3/8-inch drive ratchets, breaker bars, torque wrenches, extensions, and drive accessories Recommended Use: Transmission drain plug service, differential plug service, oil pan plug service, suspension repair, drivetrain maintenance, industrial machinery service, and large internal hex fastener work Included in Set: 1 12mm hex bit socket, 1 14mm hex bit socket, and 1 17mm hex bit socket How to Use: Identify the fastener size: Determine whether the internal hex fastener requires the 12mm, 14mm, or 17mm bit. Select the correct socket: Choose the matching hex bit socket from the set. Clean the fastener: Remove dirt, grease, rust, or debris from the internal hex recess so the bit can seat fully. Attach the socket: Press the socket onto a 3/8-inch drive ratchet, breaker bar, extension, or torque wrench until it locks in place. Seat the bit fully: Insert the hex bit completely into the fastener head before applying force. Maintain alignment: Keep the socket perpendicular to the fastener to reduce slipping or side-loading. Apply steady pressure: Turn the drive tool smoothly to loosen or tighten the fastener. Use proper torque: For installation, tighten according to the manufacturer's recommended torque specification when applicable. Remove the socket: Pull the bit straight out of the fastener after the task is complete. Clean after use: Wipe oil, grease, dirt, or metal debris from the socket and bit surfaces. Store properly: Keep the sockets in a dry toolbox, socket rail, drawer, or specialty bit socket organizer. Benefits of Using Performance Tool 3-Pc 3/8" Drive Large Metric Hex Bit Socket Set (W86023): Supports large hex fastener service: Provides the 12mm, 14mm, and 17mm sizes commonly needed for automotive and industrial repair. Helps prevent stripped plugs: Correctly sized hex bits reduce the risk of damaging transmission, differential, and oil pan plugs. Improves torque transfer: Precision fit helps deliver force evenly into the internal hex fastener. Reduces improvised tool use: Eliminates the need for undersized bits, makeshift tools, or loose-fitting alternatives. Handles demanding applications: Heat-treated chrome vanadium steel provides strength for high-torque mechanical work. Improves workshop efficiency: Compact 3-piece set keeps the most-needed large metric hex sizes available in one place. Works with common drive tools: 3/8-inch drive compatibility makes the sockets easy to integrate into existing tool collections. Supports multiple repair types: Useful for fluid service, suspension work, drivetrain repair, machinery maintenance, and general mechanical tasks. Features: 3/8-inch square drive interface: Fits standard 3/8-inch drive ratchets, torque wrenches, breaker bars, and extensions. 12mm metric hex bit: Designed for compatible large internal hex fasteners. 14mm metric hex bit: Provides coverage for common drivetrain and fluid service plugs. 17mm metric hex bit: Supports larger internal hex fastener applications. Heat-treated bit surfaces: Helps resist rounding, twisting, and wear. Chrome vanadium steel body: Provides strength and durability for mechanical service work. Precision-machined hex profile: Helps maintain secure engagement with fastener recesses. Three-piece configuration: Keeps essential large metric hex sizes together for organized use.