Clarke`s PRO162 set contains 29 Chrome Vanadium Steel Torx-Star & security bit sockets each with a 3/8" or 1/4" square drive for any equivalent square drive ratchet. The full set contains many of the most commonly needed sizes of tamper-proof fastener sockets & Torx Star driver bits. Contents includes: 3/8" drive hex adaptor. 9 x 48mm long 3/8" drive tamper proof Torx Star bits (T10 to T55). 8 x 25mm long Torx Star screwdiver bits (T8 to T40). 7 x 25mm long 1/4" drive Torx Star sockets (E4 to E11). 5 x 3/8" drive Torx Star sockets (E12 to E20).