Specifications:MaterialChromium-vanadium Alloy SteelColorBlackWill Fit Heads Sized9, 10, 11, 12, 13, 14, 15, 16, 17 ,19mm.TypeA: Short Size/B: Long SizeQuantity10pcsWeight0.5Kg Feature:▲ Especially hardened sockets with corrosion protection.▲ Designed for the removal of damaged bolts, screws and nut..