Key features and benefits Star head diameter: 31 mm (1.22 in). Helps provide a comfortable hand grip for repeat adjustments. Female thread diameter: M6. Compatible with standard M6 threaded holes in many fixtures and jigs. Total height: 21 mm (0.83 in). Compact profile that fits in tight spaces while providing solid clamping force. Material: Bakelite and Brass. Bakelite adds a lightweight, durable grip surface; brass provides strength and reliable threading. Package contents: 4 pcs clamping knob. Ready to outfit multiple fixtures or replacements in one . Screw on type design: Easy install with a simple screwin action; surface finish is smooth for a comfortable grip during operation. Why you need this Improves setup speed: Screwon installation allows quick attachment and removal without tools in most cases. Reliable grip and control: The smooth, wellfinished surface offers a comfortable, fatigue grip for frequent adjustments. Durable construction for workshop use: Brass provides durable internal threads and resistance to wear, while Bakelite offers a sturdy, insulating grip. Compatibility and performance Fits M6 female threaded holes commonly found on clamps, fixtures, jigs, and various equipment. The 31 mm star head diameter and 21 mm height balance hand comfort with strong clamping force for everyday workshop tasks. 23 practical use scenarios Woodworking jigs and fixtures: Use these knobs to secure adjustable stops or workpiece clamps on router tables or milling fixtures, enabling quick height and angle changes. Photography and videography rigs: Fasten or adjust knobs on light stands, camera mounts, or backdrop supports where reliable manual tightening is needed. DIY and general setups: worn knobs on tool benches, clamps, or mounting rails to maintain secure, repeatable adjustments in busy workshop environments.