Item Type: Hollow Drill Opener_x000D_Material: Carbide_x000D_Color: Silver_x000D_Specification: Approx. 60mm / 2.4in_x000D_Uses: Widely used for cutting clean holes in concrete, brick work, drilling wall, stone, installing air conditioners, etc. 1STANDARD SIZE: The hollow drill reamer has standard hole diameter and mounting hole size, with easy installation, stable operation and high accuracy. 2CARBIDE MATERIAL: The hole saw is forged with cemented carbide, quenched at high temperature, with high hardness and strong impact resistance. 3HIGH EFFICIENCY: The carbide hole saw has a incisive edge, hard and wear resistant, not easy to break when cutting, and has a fast drilling speed. 4FINE WELDING: High frequency welding technology, the welding opening is very firm, with precise joint, smooth internal and external welding without gaps. 5WIDE APPLICATION: Widely used for drilling holes in concrete, bricks, wall and stone, cutting and cleaning holes when installing air conditioners, etc.1 x Hollow Drill Opener