Versatile Use - - The wood hole saw allows you to drill through plywood, woods, plasterboard, acrylic, fiber cement boards, etc... Adjustable Diameter - - The adjustable drill bit is capable of drilling large diameter holes (from 30mm to 120mm) to be able to mount spotlights or recessed speakers for example. Material - - The adjustable drill bit is made of chrome steel -vanadium, anti-corrosion, anti-combat, anti-bending and reused after grinding. Advantage - - The tool has a real advantage in terms of drill diameter adjustment thus avoiding the collection of hole saws. Note - - Before drilling, make sure the 2 styli are adjusted to the same diameter and the initial rotational speed is not high. Product description Features: For drilling plywood, plasterboard, acrylic, fiber cement boards, etc... Ideal for the pipes air conditioners, fans, ceiling lights, in-ceiling speakers Allows you to drill holes 30-120mm deep. Drill mounting 6 Point Hex Shank Specification: Material: Chrome Vanadium Steel Color: Black Maximum Cutting Depth: 30mm Drill diameter: 30-120mm Weight: 490g Package Included: 1 x adjustable hole saw drill bit Note: 1. Before you start, check if all the screws are tight. 2. Be sure to hold it during operation to avoid accidents. 3. When replacing the drill, it is necessary to cut off the power. 4. Cuttings generated during drilling should be cleaned using special tools rather than manually.