Features STANDARD SIZE: The hollow drill reamer has standard hole diameter and mounting hole size, with easy installation, stable operation and high accuracy. CARBIDE MATERIAL: The hole saw is forged with cemented carbide, quenched at high temperature, with high hardness and strong impact resistance. HIGH 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. FINE WELDING: High frequency welding technology, the welding opening is very firm, with precise joint, internal and external welding without gaps. WIDE APPLICATION: Widely used for drilling holes in concrete, bricks, wall and stone, cutting and cleaning holes when installing conditioners, etc. Feature: 1. STANDARD SIZE: The hollow drill reamer has standard hole diameter and mounting hole size, with easy installation, stable operation and high accuracy. 2. CARBIDE MATERIAL: The hole saw is forged with cemented carbide, quenched at high temperature, with high hardness and strong impact resistance. 3. HIGH 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. 4. FINE WELDING: High frequency welding technology, the welding opening is very firm, with precise joint, internal and external welding without gaps. 5. WIDE APPLICATION: Widely used for drilling holes in concrete, bricks, wall and stone, cutting and cleaning holes when installing conditioners, etc. Specification: Item Type: Hollow Drill Opener Material: Carbide Color: Silver Specification: Approx. 60mm / 2.4in Uses: Widely used for cutting clean holes in concrete, brick work, drilling wall, stone, installing conditioners, etc. Package List: 1 x Hollow Drill Opener Package List 1 x Hollow Drill Opener