Specifications: Material: chrome vanadium steel Shank length: 2.2cm Shank diameter: 1/4 inch (6.35mm) Socket diameter: SAE(7pc): 3/16", 1/4", 9/32, 5/16", 11/32", 3/8",7/16" Metric(7pc): 5, 5.5, 6, 7, 8, 10, 12mm Quantity: 1 Set (14pcs)