Package Included: 1 pc 6-1/4 inch hole saw, 1 pc matching dust bowl, 1 pc arbor, 1 pc replacement drill bit, 1 pc hex key | Sharp and Durable: This hole saw is of bi-metal construction with high speed steel saw teeth and special flexible steel saw body for longer life and sharper edges. Made of high-quality plastic, this dust bowl is heat-resistant and wear-resistant for continuous use | Less Mess - Easy Cleanup: Designed for drilling holes in ceiling drywall or plasterboard, this hole saw dust bowl blocks and collects over 95% of dust, keep dust from falling on your body or on the ground | Wide Application: This kit can also be used extensively for cutting thin metal, wood, plywood, pipe, soft plaster and plastic, enough for the average DIYer as well as professional projects | Easy to Use: First assemble the hole saw, then insert the hole saw arbor into the round hole in the center of the dust bowl, and finally insert the hole saw arbor into the electric drill | Attention: Before drilling, tighten the arbor and hole saw, the tighter the better; The dust bowl is only suitable for this VIKITON bi-metal hole saws, not for any type of hole saws from other brands; The hole saw can't drill hole in glass ceramic concrete