Bits made of heat treated S2 steel would not easily break. Tien-I offers various lengths of each size for different work places and purposes. The CR-V sockets would increase strong torque. The combined bit socket would not be separated in normal use.

Customized bit sockets would be welcome especially for different lengths. Now TIEN-I offers Star bit sockets, Star tamperproof bit socket, Slotted bit socket, Phillips bit socket, Pozidriv bit socket, Hex bit socket, Ribe bit socket, and Spline bit socket.