Specification:Material: NylonType & Quantity:M3*0.5 20PCSM4*0.7 20PCSM5*0.8 10PCSM6*1.0 10PCSM8*1.25 5PCSM10*1.5 5PCSWeight: 63g / 2.2oz (approx.) Features: Made of nylon material, these acorn nuts are sturdy and durable. It is not easy to slip when turning screw with wrench, mainly used for rough and simple components. Acorn nuts can prevent nuts from getting loose and falling off. It can be used as high strength fasteners for machinery, furniture, vehicles, etc.