Manufacturer Name: Maima, Co., Ltd. [Features] Can be used for beveling round holes, countersunk screws, bolt mounting holes and chamfering. Applications: Carbon steel, alloy steel, tool steel, cast iron, copper alloy, aluminum alloy. Specifications: Effective blade diameter: 0.3 inches (8 mm), Tip diameter: 0.08 inches (2.0 mm), Total length: 1.8 inches (46 mm), Shank diameter: 0.3 inches (8 mm), Cutter tip angle: 3.5 inches (90 mm), Outer diameter: 0.4 inches (10 mm), Blade length: 0.6 inches (14 mm), Tip angle: 90° mm) Compatible models: Drill machine [Material/Finish: High speed steel (HSS).