Description: Adjustable 120/200/300mm Circle Hole Saw Drill Bit Cutter Kit DIY Tool.     Specifications:  Material: Steel body & Alloy heads;  Adjustable range: 40-300mm;  Cutting Hole Diameter: 40-120mm, 40-200mm, 40-300mm;  Cutting Depth: 30mm;  Shank Diameter:10mm (Suitable for 10mm diameter electric drill);  Suitable for drill: Plywood, Laminates, Composite, Gypsum, Rubber, Plastic, Hardwood etc.     Features:  Wide range of uses, hole diameter size can be adjustable. Alloy blades, cutting smooth, the hole wall are smooth and no glitches, good effect of the.  straight roundness, opening hole depth is 30mm.     How to use:  1. Two blades reach drill center distance are equal, can open hole.  2. Two blades reach drill center distance are not equal, can get concentric rings and circles.  3. Before drilling to check whether the blade is fixed and adjustable diameter bolts tightened to prevent accidents.  4. When the blade is not sharp please grind the blade then use.     Note: It can not be used for drill metal or stone.     Package included: 1x Circle Hole Saw Drill Bit