Klein Tools LLM15 Long-Arm Hex-Key, 1.5 mm Rust and corrosion resistant surfaces Short Arm Length: 23/32-Inch. Long Arm Length: 3-1/8-Inch. Hex Size: 1.5mm Weight: 0.005 pounds It is a Long-Arm Hex Key is made from top-grade alloy steel that is heat-treated and tempered for added strength and durability. The long side allows users to access hard-to-reach places. The short side is useful in higher torque situations and low clearances. Features Hex Key with rust and corrosion resistant surfaces Short Arm Length: 23/32-Inch. Long Arm Length: 3-1/8-Inch. Hex Size: 1.5mm Weight: 0.005 pounds Made in USA