Fits most Metric nuts, including wheel nuts and glow plugs, 8mm socket includes spring clip for holding glow plugs. Special 10mm socket for pilot shafts. Both 8mm and 12mm sockets feature an internal 6mm hex for securely holding the included screwdriver bit & wheel nut socket. Double-tip screwdriver bit for slotted & phillips head screws. Specification: Socket Wrench Sizes: 7mm, 8mm, 10mm, 12mm, 17mm Wheel Nut Socket Size: 19mm Screwdriver Bit Size: #2 Phillips, 6mm Slotted Handy storage for up to four glow plugs. Reduces clutter and weight in your field bag or tool box.