Feature: 1. This concrete hole drilling saw set is made of high quality cemented carbide, which is highly wear resistant. 2. Our concrete drilling saw set is very efficient to use and is an excellent special drilling tool. 3. This concrete drilling saw has sharp teeth, fast drilling speed and long service life. 4. The chip hole of this concrete hole saw keeps the drilling works well and ensures good cutting performance. 5. Used for opening holes in masonry concrete structure building wall. Holes for air conditioners, water pipes and range hoods can be drilled. Specification: Item Type: Hole Saw Material: Cemented Carbide Hole Opener Specifications: Approx. 35mm/1.4in, Approx. 40mm/1.6in, Approx. 50mm/2.0in, Approx. 65mm/2.6in, Approx. 80mm/3.1in, Approx. 110mm/4.3in Connecting Rod Specifications: Approx. 110mm/4.3in, Approx. 350mm/13.8in Uses: Used for opening holes in masonry concrete structure building wall. Holes for air conditioners, water pipes and range hoods can be drilled Applicable Scenarios: Home improvement building materials, mechanical engineering. Package List: 2 x Screw6 x Hole Opener2 x Connecting Rod2 x Drill