The Hillman Square Key is ideal for use on power transmission shafts to hold pulleys and gears tightly in place on the shaft. Zinc-plated for moderate corrosion-resistance, these Hillman keys are made from solid steel for maximum durability. A great addition to your tool kit, this transmission shaft square key is ready for your next job. Square key measures 3/8 in. wide x 2 in. L Part of the Hillman Deep Drawer program Square keys are small steel bars of any length with height and width being equal in measure Common in general industrial machinery Hillman keys are zinc-plated for moderate corrosion-resistance Durable transmission shaft square key made of high-strength steel One 5-piece poly-bag per sellable unit Items sold individually at retail