High quality steel material. Zinc plated finish. Size is clearly marked on each piece. Precision Brand® keystock is used to provide driving torque between shafts and pulleys, gears, sprockets, etc. Used for new machinery, general maintenance and shop repairs. It is a necessity in all applications where rotating power devices are used. Most tolerances on dimensions are oversized to assure tight fits in keyways for positive, zero backlash power transmission. Precision Brand® Key Stock, Oversized, C1018 Steel, 1 ft Length, 3/8 in Width, 1/4 in Height, Zinc Plated, Rectangle