Product Name: 10pcs 1/4-20 Thumb ScrewColor: BlackMaterial: PP + Stainless SteelProduct Size: As shown in the picturePackage Contents: 10pcs 1/4-20 Threaded Knobs Precise Dimensional Specifications – Thread diameter: 1/4 ; Thread Length: 3/4 ; Star knob diameter: 25mm/0.98 ; Star knob overall thickness: 11mm/0.43 . These carefully calibrated dimensions ensure a proper fit for a wide range of fastening needs Dual-Material Construction for Longevity – The threaded stem is forged from stainless steel, offering excellent resistance to wear, rust, and corrosion. The star-shaped grip is molded from high-grade plastic with a smooth, defect-free surface, making it lightweight yet sturdy for repeated, long-term use Comfortable & Safe Fastening – The ergonomic star profile provides superior torque control, allowing you to tighten firmly by hand without risking hand fatigue or injury. Its thoughtful design eliminates the need for wrenches, enabling quick and secure adjustments in any setting Versatile Fastener for Many Projects – From securing machinery and mechanical instruments to modifying furniture, replacing umbrella bases, or handling other industrial and workshop tasks, these threaded knobs adapt seamlessly to diverse repair, assembly, and DIY applications across multiple sectors 10-Piece Set – This kit contains 10 identical knurled wing screws, enough for multi-point installations, spare stock, or routine replacements. Keep them readily available in your work area to ensure you're always ready for emergency repairs or ongoing projects ASIN B0H8DH6CR8 Brand Zelphvt Color Black Model 5321ZOTU2680 Set Name 10 PCS 1/4-20 Thumb Screw 1/4 -20 × 3/4 Threaded Knurled Thumb Nuts Size Name 1/4 x 3/4 Metal Type Stainless Steel Unit Count 10 Count Drive Style Pin-in-Star Part Number 5321ZGMX7138 Thread Size 1/4 Thread Type Unified National Coarse Finish Types Stainless Steel Manufacturer Zelphvt Thread Style 1/4-20 Fastener Type Star Nut Item Diameter 0.25 inches Material Type Stainless Steel Item Highlight Black Plastic Star Knobs Thumb Screw Knobs with Bolts for Umbrella Base Replacement Exterior Finish Stainless Steel Item Dimensions 3.94 x 2.95 x 1.3 inches Number Of Items 10 Thread Coverage Fully Threaded Number of Pieces 10 Outside Diameter 0.98 inches Screw Head Style Screw Inside Thread Size 1/4-20