... available for glass and tile drilling. The latest glass-and-tile bits have a spear-pointed carbide ... ), 5/16" (8mm), 3/8" (10mm) and 1/2" (12mm), these spear bits provide smooth, accurate drilling ... with exception to National Holidays.Online samller order and samples order will send by international express , ... shipment, please inspect the packaging carefully, and note with the delivery driver any damage ...