GearWrench 18mm deep socket with 3/8" drive square and 6-point design. The deep-well profile reaches recessed fasteners and the threaded studs that protrude past a standard socket. Surface Drive technology applies torque to the flats of the fastener (not the corners), reducing rounding on tight or partially-rounded heads. Chrome vanadium alloy steel with full-polish chrome finish for corrosion resistance and easy cleaning. The knurled ring distinguishes metric from SAE sockets in the toolbox.

• Surface Drive off-corner loading reduces fastener rounding on hex bolts and nuts
• 6-point design grips fastener flats for maximum torque transfer on round/standard hex heads
• Deep-well length reaches recessed fasteners and bolts with long thread protrusion
• 3/8" drive square fits any standard 3/8" ratchet, breaker bar, or extension
• Chamfered opening guides the socket onto the fastener quickly
• Hard-stamped size marking resists wear from sustained use
• Knurled ring distinguishes metric from SAE at a glance
• Chrome vanadium alloy steel with full-polish chrome finish
• Meets or exceeds ASME B107.5M (metric hand-ratchet socket) specifications
• GearWrench full lifetime warranty against manufacturing defects

Application Tip (18mm): Fits M12 flange-head metric bolts (DIN 6921) - common on Japanese automotive axle nuts and motorcycle frame bolts. Deep profile useful when the fastener sits behind a brake rotor or in a recessed steering knuckle.

Tip: Use the 6-point socket on tight or partially-rounded fasteners where a 12-point would slip. Chrome (hand-tool) sockets like this one are designed for hand-ratchet use - for air or electric impact wrench work, switch to a black-oxide impact socket (the chrome finish chips under impact loads). Step up to a 1/2" drive socket and longer breaker bar for high-torque applications like lug nuts, crankshaft pulley bolts, or large suspension fasteners exceeding the 3/8" drive ratchet rating.