Mk Core Bits Drill Through Porcelain, Tile, Glass, Stone, and Masonry Drill through porcelain, granite, marble, tile, stone, and masonry Vacuum Braze Technology provides the strongest bond between diamond particles and the drilling surface of core bit Drilling Time Reduced by 5% compared with traditional metal-bond core bits No bond to wear away - diamond particles work at peak performance at all times Reverse spiral thread delivers continuous water feed to the cutting surface areas, extends bit life and improves drilling speed Core ejector slot clears debris and plugs during repeated drilling operations Designed to operate on any corded or battery-operated hand drill Hollow bore creates a core that guides the drill Diamond grit edge, no bond to wear away Slotted edge and reverse thread spiral provide more water into the cut for quicker drilling and extended drill life Heavy-duty, single piece construction Core ejection slot allows continuous drilling Diameter Part # 3/16" (5mm) 166641 1/4" (6mm) 166642 9/32" (7mm) 166972 5/16" (8mm) 166643 3/8" (1mm) 166644 1/2" (13mm) 166645 5/8" (15mm) 166646 3/4" (2mm) 166647 1" (25mm) 166648 1 - 1/4" (3mm) 166973 1 - 3/8" (35mm) 167169
