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Features:1. Wide range of uses, the hole diameter size can be adjustable.2. Alloy blades, smooth cut, the hole wall is smooth and seedless, good effect of.3. Roundness right, opening hole depth 30mm.Specifications:Material: steel body and alloy headsCutting hole diameter: 30-120mm, 30-200mm, 30-300mmDepth of cut: 30mmDiameter of the rod: 10mm (suitable for 10mm diameter electric drill)Suitable for drill: plywood, laminates, composites, gypsum, rubber, plastic, hardwood, etc.How to use:1. two blades reach the central drilling distance are equal, can open the hole.2. two blades reach the central distance of the drill are not equal, can get rings and concentric circles.3. Before drilling to check if the blade is fixed and the adjustable diameter bolts tightened to prevent accidents4. When the blade is not sharp, please grind the blade and use it.Package Included:1 x Circle Hole Cutter