Package includes 1set 65mm SDS Plus roud shank hole saws with 220mm connecting rod drills. Our set features a high-hardness center drill, making it easier than ever to achieve precise and stable material positioning and penetration. Say goodbye to drilling errors. The edge drill fast and easy and external grooves can remove the chips from drilling to making the process more clean and efficient. Wall Hole Saw Drill Bit is made of chromium steel and tungsten alloy, , -resistant, and have a long service life. Male thread adapter design,match your drill chuck fastening and much more improve speedier drilling. The of the hole saw is smooth, the waste is easier to remove when opening, and the operation is more stable and the opening effect is better. It can be used to open self leveling concrete, hollow brick, cement wall, concrete wall, red brick etc. When installing air conditioners, water pipes, , fume pipes, etc. Material:steel Package Contents: 1set * concrete saw