OGV profile socket design means more torque than a standard socket as there is a larger contact area between socket and fastener OGV profile also means less wear on the fastener and the ratchet as torque is transmitted through the fastener flats instead of the corners OGV profile also means less chance of rounding the fastener Lifetime warranty on parts Set contains: 1 x 1/4 inch 'Hand-palm' ratchet - R.161 10 x 1/4 inch 6-point metric sockets : R.05.5 - 06 - 07 - 08 - 09 - 10 - 11 - 12 - 13 - 14mm 21 x 1/4 inch series 1 bits - L 25mm Series 1 bits: ED.1T High Perf bit for Pozidriv screws : PZ1 - PZ2 - PZ3 EH.1 - Standard bit for hex countersunk screws - metric : 3.0 - 4.0 - 5.0 - 6.0 - 7.0 EP.1T - High Perf bit for Phillips screws : PH1 - PH2 - PH3 ES.1T - High Perf bit for slotted head screws : F4.5 - F6.5 - F8.0 EXR.1 - Standard for Resistorx screws : TT 10 - TT 15 - TT 20 - TT 25 - TT 27 - TT 30 - TT 40 1 x 1/4 inch socket holder bit - ECR 1 x 1/4 inch Universal joint - R.240A 1 x 1/4 inch bit holder socket with standard locking pin - R.235 1 x 1/4 inch short screwdriver handle - R.236C 2 x 1/4 inch standard extension L 55 mm - L 100mm Warning:Chrome sockets and adaptors should only be used with hand operated handles and ratchets