USEFUL ACCESSORY: The nut cap can prevent the loosening of the nut. 145 pieces; M4 M5 M6 M8 M10 M12 is available EASY TO TAKE: All are well stored in a plastic box for easy transport and use. USED FOR: The nut cap can be used for high strength fasteners, mechanical fasteners, furniture fasteners, vehicle fasteners and automotive shaped parts. MATERIAL: The nut cap kit is made of high quality rubber, high strength, not easy to break. HOW TO USE: Use the wrench to fix the main screw when disassembling, it is not easy to slip, and it is mainly used for rough and simple components. Package includes: 50 x M4 nut cover covers, 30 x cover - M5 nut covers, 20 x M6 nut covers, 10 x M8 nut covers, 20 x M10 nut covers, 15 x M12 nut covers