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Ideal for installing ceiling speakers, recessed lighting, or any project requiring a round hole to be cut. Cuts up to a 10" round hole in ceilings, walls, and floors. Cuts plywood, plasterboard, and acrylic up to 1" thick. Features include: Can be used with any variable speed drill. Cutting radius is freely adjustable via adjusting lever. Support base steadies the drill bit while cutting and keeps the cut perpendicular to the surface. Transparent cowl prevents chips from flying into eyes while cutting.