Features: 1. and durable carbide tip can be reused after grinding. 2. The hole diameter can be adjusted by the distance from the drill bit tip to the center. 3. Alloy steel with heat treatment can be used for thin-film plate. 4. Can be installed and operated on the electric drill and bench drill. 5. Widely used in wooden board, plastic board, gypsum board, etc. Spec: 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 Notice: 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.