Add On Tool Kit Adjustable spark plug socket with twist bar. Socket driver handle w/sockets sizes: 5mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, flat edge CR-V5, flat edge CR-V6, Philips CR-VPH2, Phillips CR-VPH1, socket adapters (2), double end master wrench 3/8" and 13/16", double end wrench: 22mm & 19mm, 17mm & 14mm, 14mm & 12mm, 11mm & 10mm and pliers with rubberized handles. Made of steel