Impact Grade Socket Adapter, 18Pcs/16Pcs[High Quality] Made of heat-treated hardened chrome Vanadium(CR-V) steel, good abrasion resistance and high hardness, without breaking or rusting, heavy duty impact driver socket adapter set[Secured Fit] Spring loaded ball bearing on head, designed to fit securely while providing versatility and convenience no matter which tool you use[Shank of Diameter] 1/4” hex shank interface, fast connect, work on quick change drill chuck, standard drill chuck, handheld screwdriver, electric screwdriver, change your hand socket set into a driven socket set[8 Size for Various Task] 1/2” 1/4” 3/8” changing square shank size, 25mm/0.98”, 30mm/1.18”, 50mm/1.96”, 65mm/2.55”, 72mm/2.83” different length socket drill set[Woodworking Essential] Impact socket adapter is suitable for both serious hobbyist woodworker and occasional DIYer, auto parts repairs and household maintenance, machinery, motor vehicle, cars, etc. You will need onePackage includes:18pcs: 16 x Socket adapters 2 x Hexagonal connecting rods16pcs：16 x Socket adapters