Replacement for your broken one with Star Knob. Screw in type for easy installation and with nice workmanship for comfortable grip. Widely used for mechanical equipment, instruments and apparatus, food and pharmaceutical industry equipment. Product Name: Clamping Knob Head Diameter: 50mm / 2inch Head Diameter: 10mm / 0.3inch Total Length: 28mm / 1.1inch Color: Silver Tone, Black Material: Metal, Plastic Weight: 416g Package Contents: 8 x Clamping Knob Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.