Flat Bottom Design Flat Counterbore Drill HSS Hole Expanding Bit Screw Mount Hole Drilling

Label:Yes Optimized chip flute design accelerates chip evacuation, reduces cutting resistance and improves processing efficiency in manual and machine tool operation. Widely applied in hardware, mold and mechanical processing fields, ideal auxiliary drill bit for pre-processing screw mounting counterbore holes. Made of premium high speed steel with integral quenching treatment, this countersink cutter owns high hardness and outstanding wear resistance for long-term cutting. Covering complete specifications from M3 to M12, it meets diverse demands of countersinking, reaming and hole expansion for different screw installation holes. Flat bottom cutting structure ensures neat and flat sinking surface, effectively avoiding burrs and deformation on workpiece metal surface during machining.

Specification: Type: Counterbore End Mill Material: High Speed Steel Size:As shown

Package Including: 1PCS Counterbore End Mills

Note: 1. Please note that the photo does not show actual size, please refer to Description for size details. 2. Please allow 5-10mm(0.20-0.39in) differences due to manual measurement, thanks.