Description: _x000D_ Countersink end mill cutter is a special made tool mainly used to cut such a hole allows the head of a bolt or screw. This kind of cutter cut hole and bottom hole with high alignment precision, Due to its high production efficiency, it is commonly used for machining industry. _x000D_ _x000D_ _x000D_ Features: _x000D_ Mill cutters are made of hard high speed steel, usually used to be assembled on milling machine._x000D_ _x000D_ Suitable for milling of copper, aluminum, steel, cast iron, etc. _x000D_ High toughness, abrasion resistance, high-speed cutting for the high hardness. _x000D_ Can processing directly or fine processing to the heat treatment mold. _x000D_ Reduces times of changing tools, improves machine actuator movement efficiency and save mold making time. _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Material: HSS-AL super-hard high speed steel _x000D_ Hardness: HRC65~68 _x000D_ Size:(Boot*Blade Diameter*Shank Diameter*Full Length) _x000D_ M3=3.2*5.9*6*45mm _x000D_ M4=4.2*7.4*6*48mm _x000D_ M5=5.2*8.9*6*51mm _x000D_ M6=6.2*10.4*8*58mm _x000D_ M8=8.2*13.4*10*67mm _x000D_ Weight: 128g(approx.) _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 1 Set(5pcs) x Countersink Mill Cutters _x000D_ _x000D_ _x000D_ Note:_x000D_ 1. Please allow 1-2mm error due to manual measurement. Thanks for your understanding._x000D_ 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.