The Capri Tools bit sockets are made for the most demanding professionals. Each of our bit sockets is made from custom forged steel that underwent a proprietary heat treatment process and precisely machined to perform in toughest situations. Premium S2 steel forged bits (1/2 in. and below) are exceptionally strong and durable. They withstand high torque and do not twist, protecting both the bit and the fastener. The largest bits (9/16 in. and above) are forged with custom Chrome Vanadium steel, giving these large bits balanced tensile strength for optimal performance. The bits are made true-to-size for their entire length, letting you use the full length of the bit. All bits feature chamfered end to ensure a smooth fit onto fasteners. The sockets are constructed with premium Chrome Vanadium steel and plated with our own chrome protective plating. They are durable and resist corrosion. The bits come installed on our premium double-sided socket rail to keep the socket bits securely organized. Meets and exceeds ASME B107.110 standards. Set includes (13) hex bit sockets in SAE: 1/4 in. drive: 1/8, 9/64, 5/32, 3/16, 7/32, 1/4 in., 3/8 in. drive: 5/16, 3/8 in., 1/2 in. drive: 7/16, 1/2, 9/16, 5/8, 3/4 in.