Material: This clamping screw knob is made of high quality plastic, smooth surface without burrs, not easy to rust, corrosion resistance, durable.
Features: screw head star design, comfortable grip, ergonomic, easy to save energy, not easy to scratch your hand.
Scope of Application: our hex shaped clamping knob is suitable for speaker stands, automotive, woodworking jigs, industrial instruments and other mechanical equipment.
Thread Size: M8x20mm/0.31"x0.79"(RxL), head diameter is about 38mm/1.5".
Package Contains:You will get 2 pcs black Thread Knob Tightening Screw.Please confirm the thread size you need before purchase.