MATERIAL - CARBIDE STEEL: Made of cemented carbide and heat treated. High hardness and heat resistant, the high temperature generated during drilling will not deform it, also wear resistant, can be used for a very long time. High concentricity, so the processing precision is high and the noise is low. LARGE SIZE VERSION - 50MM: The package includes 50mm. Guided by the circular rim, the bores all have an arc in any direction; ensures a true, precise and clean flat bottom hole with rapid waste removal and ensures your work efficiently. X-wing DESIGN FOR PRECISION: The X-wing head provides visibility and stability during operation. The center spur of each bit ensures precise drilling and prevents walking and wobbling during operation, creating perfectly round and precise holes with the center spur design. HOLES DRILL CUTTING: Suitable for drill press, pistol drill, drill press, vertical drill, handheld electric drill, pedestal motorized drill and movable band magnetism drill for mounting spherical tip of door, drawer; perforation on wooden products, plastic products, wood and plywood.