Forged from chrome moly steel. Hardened and tempered for enhanced durability. Sizes: 29, 30, 31, 32, 33, 34, 35, 36 and 38mm 1/2" drive so will fit any 1/2" drive ratchets / bars / extensions etc. 12 Point Overall length: 78mm Material: 42 CR-MO for strength Hardened: HRC 45 for durability Finish: Black phosphate for protection Dimensions 29mm socket - O/D of socket end is 42mm - Wall thickness is 6.2mm 30mm socket - O/D of socket end is 43mm - Wall thickness is 6.2mm 31mm socket - O/D of socket end is 44mm - Wall thickness is 6.2mm 32mm socket - O/D of socket end is 45mm - Wall thickness is 6.2mm 33mm socket - O/D of socket end is 47mm - Wall thickness is 6.4mm 34mm socket - O/D of socket end is 48mm - Wall thickness is 6.4mm 35mm socket - O/D of socket end is 50mm - Wall thickness is 6.4mm 36mm socket - O/D of socket end is 51mm - Wall thickness is 6.7mm 38mm socket - O/D of socket end is 53mm - Wall thickness is 7.2mm All sockets - length 78mm All sockets - O/D of drive end is 36mm