Features Quality Steel Body: Sharp and durable carbide tip can be reused after grinding. Cutter : Dimension: The hole diameter can be adjusted by the distance from the drill bit tip to the center.Cutting Hole Diameter: 1-3/16" - 12"(30 - 300mm), Cutting Depth: 1/8 "-2"(3 - 50mm), Shank Diameter: 3/8" (10mm) Applied: This hex shank circle cutter is great for making smooth cuts through most materials, including wood, composite, sheet metal and more. Easy to Use: Can be installed and operated on the electric drill and bench drill.you can adjust the tips distance according to your real needs. Widely used in wooden board, plastic board, gypsum board, plywood, laminate, composite materials, rubber, , etc(Can niot be used in any metal Material) Specifications: Material: alloy steel Color: silver Shape: airplane Hole diameter range: 30-300mm / 1.18-11.81in Weight: Approx. 518g   Package Includes: 1 x Adjustable Hole Saw Drill Bit Set   Note: 1. Before starting operation, check if all the screws are tightened. 2. Be sure to hold it during operation to prevent accidents. 3. When replacing the drill, it is necessary to cut off the power. 4. Cuttings generated during drilling should be cleaned by special tools rather than hand. 5. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List