Made of carbon steel with galvanized surface treatment and plastic material, the hexagon star shape handles offer strength and durability for a variety of applications, rust and corrosion resistant that can be applied for a long time. The clamping screw knob adopts a star shape design with smooth lines, easy-to-turn finger grip spacing, and can be installed and removed manually without the need for additional tools. Great replacement for your broken and old one with this knob. Screw on type design with mounting nuts and washers for easy installation. With surface nice finish for comfortable grip,  please confirm the thread size and length before buying. Widely used for lathe machine, mechanical equipment, instrument, umbrella stands and industry equipment. Also good for furniture decoration such as cabinets, drawers, doors, rack bracket and other related industries. Material: Plastic, Carbon Steel Thread Size: M6 x 40mm / M6 x 1.57inch(D*L) Thread Pitch: 1mm Total Height: 52mm / 2.05inch Head Dia (Approx): 32mm / 1.26inch 20Pcs x Screw Knob; 20Pcs x Washers; 20Pcs x Nuts