Twist Socket sets are ideal for the removal of rounded, damaged or corroded nuts, bolts, oil drain plugs, marine nuts and bolts, exhaust manifold nuts, pipe nipples, and studs. Stripped nuts are very difficult and time consuming to remove. Ordinary sockets and wrenches just slip off and strip nuts even more. This set Include: 10PCS 3/8 Drive Twist Socket 10mm; 11mm; 12mm; 13mm; 14mm; 15mm; 16mm; 17mm; 19mm 1PC Knock-out punch.