Attributes:* Male Thread Diameter: M4 (0.7mm Pitch)* Thread Length: 7mm / 0.28"* Round Head Diameter: 13mm / 0.51"* Total Length: 13mm / 0.51"* Material: Carbon Steel, Plastic* Finish: Zinc Plated* Head Color: BlackWhat Is Included:* 50 Pieces x Clamping KnobApplications & Features:--- The screw-in design allows the clamping knob grip to be easily installed and removed without any tools. It can be widely used in hardware, furniture decoration, lighting equipment, mechanical equipment, electronic equipment, lathes, drilling machines, table saws, instruments and meters, industrial equipment, etc.--- The thumb screw adopts a deepened thread design, with a smooth and uniform surface, no burrs, a firm grip, and is not easy to slip.