jiuwu 8 Pack Carbide Steel Concrete Hole Saw Opener 35mm 40mm 50mm 65mm 80mm 110mm SDS Plus Shank Drill Bit Set for Cement Brick Wall Stone with 110mm/350mm Square Connecting Rod

* Note: In the process of punching hole, Suggested that adding water cooling to help to extend the service life of the product. * High-frequency welding technology, welding openings is very strong, smooth inside and outside welding mouth. * Materials that can be opened: cement wall, concrete wall, brick wall and so on for the installation of air conditioning, water pipes, water heaters, sewers, etc. *The surface of the hole opener is sandblasted and the waste is easily removed from the hole opener. * Using the Electric Hammer of the impact + rotation function on the Wall, Hollow Brick to operate Air Conditioning Holes, Pipe Holes and so on. * Simple operation, easy to use,and fast perforated. * Package include: 1x 110mm/4.33" long square connecting rods 1x 350mm/13.78" long square connecting rods 1x 35mm / 1.38" drill bit 1x 40mm / 1.57" drill bit 1x 50mm / 1.96" drill bit drill bit 1x 65mm / 2.56" drill bit drill bit 1x 80mm / 3.15" drill bit drill bit 1x 110mm / 4.33" drill bit drill bit 2x Center Positioning Drill Bits 2x Drill Screws

• Drill bit set Material: Chrome Vanadium Steel.
• The Hole Saw Sets include a wide range of sizes. Widely used for installing the Air Conditioner, Oil Fume Exhauster and Sewer Pipeline Hole Open ect. Mainly work on the Opening Hole Operation of Wall and Brick structure, such as Red brick and Cement.
• High-frequency welding technology, welding openings is very strong, smooth inside and outside welding mouth, precision engage, appearance.
• Pay attention to coolant when operating. These drill bit sets will help contractors and DIY enthusiasts easily operate and access tight spaces.
• Packing specification: 2x long square connecting rods +( 35mm / 1.38"" drill bit ) + ( 40mm / 1.57"" drill bit ) + ( 50mm / 1.96"" drill bit ) + ( 65mm / 2.56"" drill bit ) + ( 80mm / 3.15"" drill bit )+ ( 110mm / 4.33"" drill bit )+ 2x Center positioning drill bits&screws.