This comprehensive 172 piece socket set uses the superior grip of the Super Lock profile for its shallow sockets and the standard 6 point profile for it's deep sockets. With a good selection of 1/4", 3/8" and 1/2" drive accessories and a hand ratchet for each drive size, this set will be a good addition to anyone's tool collection. Super Lock sockets use a unique design meaning the greater the torque applied, the more they will grip the nut or bolt. Very handy for removing stubborn, worn or rusty nuts and bolts. 1/4" Drive: 13 - Shallow Super Lock Sockets: 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11, 12, 13, 14mm 7 - Deep Sockets Standard 6 Point: 4, 5, 6, 7, 8, 9, 10mm 5 - E-Profile Sockets: E4, E5, E6, E7, E8 8 - Star Bit Sockets: T8, T9, T10, T15, T20, T25, T27, T30 8 - Tamper Star Bits: T8H, T9H, T10H, T15H, T20H, T25H, T27H, T30H 3 - Pozi Screwdriver Bit Sockets: PZ0, PZ1, PZ2 3 - Philips Screwdriver Bit Sockets: PH0, PH1, PH2 4 - Slotted Screwdriver Bit Sockets: SL4.5, SL5, SL6.5, SL7 4 -