10PCS 1/4-20 Black Star Knobs, Threaded Knurled Thumb Nuts for Mechanical Instrument, Grip Knob Screw/Star Hand Knob for Umbrella Base Replacement, Female

Good Material: The black knobs clamping screws are smooth and burr-free overall. The head of threaded knurled thumb nuts are made of plastic, sturdy and durable, not easy to deform, comfortable to hold, not easy to fall off. The star hand knob is made of carbon steel with galvanized surface, high hardness, deep and clear threads, smooth rotation, uniform force without slippery, good fastening effect Size: Male thread type: 1/4-20; Head diameter: 25mm/ 0.98 Inch, Screw diameter: 1/4, Nominal length of screw: 20mm/ 0.79 Inch, the black knobs clamping screws provide a safe and firm clamping action, and black plastic hex shaped clamping knob handle allows the tightening control to be adjusted at any time Easy to Control: The female threaded hexagon head thru knob clamping knobs adopt a special star design, well-made, ergonomic, comfortable to hold, and provides ideal grip, so that you have better control and precision Good Design: Hex shaped clamping knob handle provides excellent tightening control to screw effectively and safely without scratching hands Wide Application: These star threaded knurled thumb nuts can be applied to various fields such as car roof handling boxes, workshop equipment fixation, woodworking jigs, drawing boards, etc. Nut is securely embedded and very strong Knobs that are small in diameter to fit in a tight space