PRODUCT APPLICATIONSThese star clamping knobs are good for various applications requiring quick adjustments, such as woodworking fixtures, machinery, equipment assembly, lathes, drill presses, sawing machines, packaging, printing equipment, electronics equipment, light fixtures, and patio umbrella brackets, etc.PRODUCT DETAILS INCLUDE Color: Black Material: Plastic, Carbon Steel Surface Finish: Zinc Plated Thread Pitch: 1.25 mm/ 0.05 inch Thread Size: M8x20mm/ M8x0.79 inch (DxL) Head Width: 39 mm/ 1.54inch Total Length: 40 mm/ 1.58 inch Package Includes: 8Pcs x 5-Point Head Male Thread Star KnobsPRODUCT ADVANTAGES1. Constructed with zinc-plated carbon steel with deep and clear threaded studs for durability and wear resistance, these good plastic male thread clamping knobs provide a smooth surface and comfortable grip.2. This star hand knob with a thermoset plastic knob can securely connect the parts and is easy to install. 5-Point Head Star knobs offer ease of grip and turning by hand, providing leverage and comfort for effortless tightening or loosening.ATTENTIONA great replacement for your broken machine handle. No tools are required to install and remove. Avoid over-tightening the knob to prevent potential damage or stripping of threads in the mating assembly.