[Fully Ground Process & 135-degree Split Point]Fully ground spiral groove design quickly decreases friction and heat for a faster and cooler drilling performance. 135-degree split point with straight shank prevents walking and makes drilling precise and faster. No center punch is needed. [Multiple Application]Suitable for Cutting such as Wood, Plastic, Aluminum Alloy, and Other Softer Metals. [Work Efficiently]The product has sharp edges and high drilling efficiency. The center of the product has sharp serrations, and with its help, the drill can continue to drill horizontally after drilling.<br><br>Product specifications: 4mm This is a 3 in 1 serrated drill: Function 1: Can be used as a drill Function 2: Can be used as a sawtooth groove Function 3: Can be used as a saw blade on the surface of wood Colour:As Shown Material:Metal<br><br>Package Contents: 1 x Drill Bits<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.