MATERIAL - CARBIDE STEEL: Made of cemented carbide and heat treated. High hardness and heat resistant, the high temperature generated during drilling will not decompatiblem it, also wear resistant, can be used compatible a very long time. High concentricity, so the processing precision is high and the noise is low. LARGE SIZE VERSION - 42MM: Package includes 42mm. Guided by the circular rim, the bores all arc in any direction; ensures a true, precise and clean flat-bottomed hole with rapid disposal of waste and which ensures your work with efficiency. X-wing DESIGN compatible PRECISION: The 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. DRILLING CUTOUT HOLES: Suitable compatible drill press, pistol drill, drill press, vertical drill, hand-held electric drill, motorized pedestal drill and moving tape magnetism drill compatible mounting ball point of door, drawer ; percompatibleation on wood products, plastic products, wood and plywood. EASY TO STORE AND SELECT: Each bit comes in its own plastic box and the size has been marked on the box, so you can get the right bit on the shelf in seconds. Specifications: Size: 42mm. Material: titanium alloy. Individual/group: individual. Stem Style: Straight. Tools Product type: power tool Package: 1 drill with plastic package.