This 10 Pieces XZN Triple Square Spline Bit Socket Set, which Include: 1/4 inch Drive: 4mm, 5mm, 6mm; 3/8 inch Drive: 8mm, 9mm, 10mm, 12mm, 14mm(tamper proof); 1/2 inch Drive: 16mm(tamper proof), 18mm(tamper proof). The total length of this XZN triple square spline bit socket is 4 inches. The Bits is made of premium S2 alloy steel for superior hardness that reduce wear-outs and insure longevity, the precisely machined bit tips to ensure accurate size, chamfered bit ends insert smoothly into fasteners and protect both bits and fasteners from damaged edges. Also the Cr-V steel sockets provide superior torque for greater turning power with mirror chrome finish for corrosion resistance. This set is included with a durable blow-molded storage case. Colour:Silver Material:steel Size:22 x 5.5 x 13cm Package Contents: 1 set * Tip Bit Socket Only the above package content, other products are not included. Note: Light shooting 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.