Through-hole design makes it easier to replace worn or broken bits. Simply pop the old bit out and insert a new replacement bit. C-Clip retention groove in the hex end provides a secure hold on the bit while in use. Bits are manufactured to rigid standards using high strength S2 steel. High-torque can be achieved with the use of a ratchet, T-handle or spinner handle. With the help of an extension or universal joint, bits can be used in awkward spaces. Set Contains: 1/4 Drive - T10, T15, T20, T25, T27, T30 TORX Bit Sockets 3/8 Drive - T40, T45, T50, T55 TORX Bit Sockets. Packaged on a rail.