ITEM: Diamond M14 Vacuum Brazed Serrated Drill Bit Quantity: 1pc only Specification: Diameter: 20/25/30/32/35/50/68/110mm; Diamond height:10mm; Total length: 60mm Application: Drilling ceramic granite marble nature stone and concrete Feature: 1.High-quality diamond, sharp and durable, long service life. 2.Easy chip removal: There are several chip removal grooves between the teeth, which can quickly remove dust during drilling and are not easy to be clogged. 3.Serrated cutterhead: improves the sharpness and drilling speed. NOTE: 1, recommended for angle grinder 2、Use 45°beveled angle positioning, gradually vertical and rocking left and right drilling;