'Machine Key, Oversized, Rounded End Type, Steel, Plain Finish, 3/4 In Length, 3/16 In Square, +0.002 In Thickness Tolerance, -0.030 In Length Tolerance, Tensile Strength 64,000 PSI, Rockwell Hardness B85, Holds Pulleys and Gears on Transmission Shafts, Package 5'