Features:1. Sharp and durable carbide tip can be reused after grinding.2. The hole diameter can be adjusted by the distance from the drillbit 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.Specifications:Material: alloy steelColor: silverShape: airplaneHole diameter range: 30-300mm / 1.18-11.81inWeight: Approx. 518gPackage Includes:1 x Adjustable Hole Saw Drill Bit SetNote: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 specialtools 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..