[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 edges and high drilling efficiency. The center of the product has serrations, and with its help, the drill can continue to drill horizontally after drilling. 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 groove Function 3: Can be used as a saw blade on the of wood Colour:As Shown Material:Metal Package Contents: 1 x Drill Bits 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.