Used to protect the surface of the connected parts from the nuts, the nuts on the connected parts of the pressure.
Package details:
M2*5*0.5mm 250pcs,
M2.5*5.5*0.5mm 250pcs,
M3*7*0.5mm 200pcs,
M4*9*0.8mm 100pcs,
M5*10*1.0mm 70pcs,
M6*12*1.0mm 50pcs,
M8*16*1.5mm 50pcs,
M10*20*2mm 20pcs,
M12*24*2.5mm 10pcs.