The ATD Tools 10-pc 1" Drive Truck Wheel Service Set, No. 7610, is heat-treated for strength and durability. Manufactured using chrome molybdenum alloy steel, the set meets or exceeds ANSI specifications. The set includes: 13/16", 17mm, and 21mm 4-point standard sockets; 33mm, 35mm, and 41mm 6-point deep sockets; 1-1/16", 1-1/8", and 1-1/4" 6-point extra deep sockets; and 1-1/2" wheel socket by 13/16" square.