DURABLE STAR HEAD-- The star head is made of high quality plastic, good toughness and impact resistance, and durable. NON-RUST SCREWS -- The screws are made of high quality iron, surface electroplated, high hardness, anti-rust, sturdy and durable. EASY TO USE-- Large plastic knurled handle for easy grip comfortable, fully threaded screw type design for easy installation, removal and adjustment. WIDE APPLICATION-- These thumbscrews are widely used for mechanical equipment, electronic equipment, communication equipment, hardware, furniture decoration and other related industries. PACK OF 10-- Each package includes 10 M6*25mm thumb screws. Thread Length: 25mm; thread diameter: M6, metric thread. The head is made of premium plastic material,durable and environmental Screw is made of high-quality steel, the surface is plantd zinc, rust-proof and corrosion-resistance Plum gum thumb screw,smooth surface and thicker base, hexagon design is convenient for you to use and install