Descriptions:* Great replacement for your broken one with this Knurled Knob.* Screw on type design for easy install and with surface nice finish for comfortable grip.* Widely used for lathe machine, mechanical equipment, instrument and apparatus, food and industry equipment. Specifications:Product Name: Clamping KnobKnurled Head Diameter: 16mm/ 0.63''Male Thread Diameter: M4Thread Length: 10mm/ 0.39"Total Height: 21mm/ 0.82"Net Weight: 86gMain Color: Black, Silver ToneMaterial: Thermoset Plastic, Metal Package Content:20 Pcs x Clamping Knob