Feature: 1. YG8 ALLOY: Made of solids carbide tipped metal material for years of service in the harshest conditions with no compromise on performance 2. WELDING TECHNOLOGY: Adopts high frequency welding technology, the welding opening is very strong, and the inner and outer welding seam is glazed 3. WIDE APPLICATIONS: Ideal for drilling concrete wall, stones, bricks, cement, masonry, aerated blocks, slump blocks, air conditioning installations, etc. 4. EASY TO USE: This wall hole saw is durable and portable, which for hole opening in masonry concrete structures 5. BASIC SPECIFICATIONS: The hole saw of this wall hole tool is 65mm, 80mm, the round shank connecting rod is 110mm, and the color is silver Specification: Item Type: Concrete Hole Saw Set Material: 45 Steel + YG8 Alloy Color: Silver Specifications: Hole Opener: Approx. 65mm / 2.56in, 80mm / 3.15in Round Shank Connecting Rod: Approx. 110mm / 4.33in Uses: Used for opening holes in masonry concrete structures, the electric hammer is suitable for hitting brick wall and cement wall, but not steel bars, tiles and stones. Package List: 1 x Round Shank Connecting Rod2 x Hole Opener1 x Twist Drill1 x Screw