For quick attachment and release of discs and grinding wheels without the need for a wrench Beautiful finishes: The underside has a slightly frosted texture to increase friction. The nut can firmly lock the sanding disc and not slip off easily Premium Material: This angle grinder collet nut is made of high-strength alloy material which does not deform, which bears 40N torque and 12000rpm high rotating speed. Its quality is guaranteed and its lifespan is long Quick clamping nut with M14 thread for grinder Precise and easy saves considerable time < /ul>