• Knurled black plastic knob, ergonomic and comfortable to hold, with a full-thread design for easy installation, removal, and adjustment. • Star-shaped head made of durable plastic, with excellent hardness and impact resistance, providing a firm and secure grip. • Screw made of high-quality iron with a galvanized surface, giving it high hardness, oxidation resistance, and durability. • The package contains 10 M8x30mm knob screws. Dimensions: handle diameter 38mm, thread length 30mm, thread diameter 8mm. • Suitable for applications in mechanical, electronic, communication equipment, hardware, and furniture decoration.