●There are 10pcs M6 and 10pcs M8 thread clamping knobs in the packaging, available in two sizes to meet your different needs. ●M6 and M8 Female Knob Screws are made of high quality plastic and copper, , with good toughness and strong anti-aging ability and long service life. ●The star shaped design is used to increase the sense of use during rotation, with good toughness and impact resistance. ●The surface of M6 and M8 internal thread knobs has been polished, and even if rotated for a long time, they will not hurt hands. ●These star shaped screws are widely used in mechanical equipment, electronic equipment, communication equipment, hardware, furniture decoration and other related industries.