Assortment contains 1 each of 7 different sizes. Made from low carbon steel material. Zinc plated finish. Precision Brand® step keystock is used in the transmission of power from a shaft to a gear, sprocket, sheave, pulley, coupling, etc. Often referred to as \"offset keystock\". Assortment contains one each of: 3/16 in x 3/32 in x 1/8 in x 1/16 in type 1; 3/16 in x 3/32 in x 1/4 in x 1/8 in type 2, 1/4 in x 1/8 in x 5/16 in x 1/8 in type 2, 1/4 in x 1/8 in x 3/8 in x 3/16 in type 2, 3/8 in x 3/16 in x 5/16 in x 5/32 in type 1, 3/8 in x 3/16 in x 1/2 in x 1/4 in type 2 and 1/2 in x 1/4 in x 5/8 in x 5/16 in type 2. Precision Brand® Step Keystock Assortment, 7 Piece, 12 in L, Steel, Zinc Plated