3 Piece, Impact Socket Adapter Set, Contains Sizes: 1/4", 3/8" & 1/2", Fit The Most Common Sockets Eliminating Extra Adapters, Drop Forged, Heat Treated, CRV Steel For Strength, Double Grooved Shaft Locks Into Multiple Types Of Impact Drills, Locking Ball On Tip Holds Socket In Place, Adapts Sockets To Power Drills & Drivers For A Secure Hold, Turn Electric Or Cordless Drill Into A Powerful 1/2", 3/8", Or 1/4" Socket Driver.