Fast Drilling: Featuring a 4-blade serrated eccentric drill design, this drill bit is , wear-, and made with high-hardness materials for quick and efficient hole drilling Hex Anti-Slip Shank: The hexagonal shank ensures a secure, slip- grip, while the specially designed creates an alternating cutting motion for better drilling efficiency Threaded Chip Removal Design: The drill bit is designed with a threaded chip removal groove that expands the space for cooling, ensuring smooth chip discharge and preventing clogging High-quality Materials: Made from high-quality alloy steel, this drill bit is , sturdy, and has a long service life Versatile Application: Suitable for a variety of materials including stone, cement, wood, ordinary tiles, brick walls, and more. For tougher materials like marble or glass, water cooling is recommended, Manufacturer: Suoumwa