Clamping knob head is made of plastic, and the is made of stainless steel, and have a . Star shape design, great for comfortable hand grip, with ergonomic design and plays a non-slip effect without scratching your hands. Universally fit and can be used for most types of machine tools. Features - Material: ABS + Stainless Steel. - Size: 4.60X4.60X4.30cm/ 1.81X1.81X1.69inch. - This product is made of plastic and stainless steel, which makes it and . - These screw knob replacements are easy to tighten/loosen and no extra tool required. - This threaded knobs adopts star design, comfortable in hand, ergonomic, easy to turn with just your fingers. - Plastic screw-on handle clamping knob for mechanical equipment, instrument and apparatus. - This kit includes sufficient quantities, which definitely meet your daily needs. Package list: 4 x screws