General description Forged from chrome moly steel, the US PRO Hub Nut Deep Impact Socket Set is designed for durability and strength. This 9-piece set includes sockets ranging from 29mm to 38mm, making it compatible with any 1/2" drive ratchets, bars, or extensions. Technical specifications Material: 42 CR-MO Hardened: HRC 45 Finish: Black phosphate Overall length of sockets: 78mm Sizes included: 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 38mm Outer diameter (O/D) and wall thickness for each socket: 29mm - O/D: 42mm, Wall thickness: 6.2mm 30mm - O/D: 43mm, Wall thickness: 6.2mm 31mm - O/D: 44mm, Wall thickness: 6.2mm 32mm - O/D: 45mm, Wall thickness: 6.2mm 33mm - O/D: 47mm, Wall thickness: 6.4mm 34mm - O/D: 48mm, Wall thickness: 6.4mm 35mm - O/D: 50mm, Wall thickness: 6.4mm 36mm - O/D: 51mm, Wall thickness: 6.7mm 38mm - O/D: 53mm, Wall thickness: 7.2mm O/D of drive end for all sockets: 36mm