Thin Wall Core Drill Bit for smooth chip free coring of porcelain, natural stone, engineered stone, granite, and moreModel Diameter Width ThicknessGrit GradeDBA203/4"(20mm)8mm1.5mmStandardDBA251"(25mm)8mm1.5mmStandardDBA281-1/8"(28mm)8mm1.5mmStandardDBA321
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