1/2-inch drive, 10mm triple square spline sizeBits made of premium S2 alloy steel for superior hardness and great rust resistantChrome vanadium steel socket for high strength and superior torqueNotched drive ends fit any 1/2-inch drive ratchet or extension, preventing them from falling offWide application in DIY hand-making, automotive repairs, household maintenance, and most general repairsProduct Name: Triple Square Spline Bit SocketMaterial: Chrome Vanadium Steel, S2 SteelColor: photo color Weight: 105gDriver Size: 1/2 InchBit Size: Spline 10mmBit Length: 64mm / 252 Inch Length: 100mm / 4 InchPackage Content: 1 x Triple Square Spline Bit SocketOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.