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Features: 1) Core Bits are made to drill a variety of aggregates including concrete,sphalt,granite, marble, masonry, or natural stone. 2) Core Bits can be used to make any type of opening. 3) Coring continuous holes, commonly referred to as stitch or line drilling, creates the shape of the desired opening. 4) Most coring bits can be run by an electric drill motor ranging from 1/2" to 12" diameter, powered by a minimum 120 volt 15Amp.[ZL diamond tools co.,ltd.]
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