Enhance your wall mounting projects with our self drilling screws. Featuring an expanded design with tapered tips, these screws provide maximum grip for a secure hold on the wall. Say goodbye to pre-drilling holes as these innovative screws simplify installation - just insert, tighten the screws, and you're good to go. Crafted from durable galvanized steel, these screws offer unparalleled strength for heavy loads. They are wall-friendly and reusable, leaving no damage when removed. Ideal for various applications in both home and office settings, trust our screws for a reliable and worry-free installation solution. Item Name: Self Drilling Screw Material: Galvanized Manganese Steel Features: High Hardness, Rustproof, Durable, Long Lasting Size Details: Size 12*30: Expansion Tube: 3cm/1.18" (Approx.) Screw: 3.5cm/1.38" (Approx.) Size 12*40: Expansion Tube: 4cm/1.57" (Approx.) Screw: 4.5cm/1.77" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: Style 20Pcs: 20 x Self Drilling Screws Or Style 40Pcs: 40 x Self Drilling Screws Or Style 50Pcs: 50 x Self Drilling Screws