Stanley® Proto® 9-Piece Folding Hex Key Set has a 4 1/2" case that is made of chrome-plated steel for added durability. Set contains 1 7/16 - 2 3/4" long black oxide bits and 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32" and 1/4" hex keys.
Features
Made using a heat treated alloy for wear-resistance which helps minimize distortion for a long life.
Hex opening holds the bit allowing the bit holder to take the torque load.
