40mm Diameter 65mm Overall Length 7° Taper Angle Tapered Chisel Bit And Tapered Drill Bit For Hard Rock Henglong, a professional rock drilling tool maker, presents this 40mm tapered chisel bit built for heavy-duty mining and quarry work. Engineered for reliability and performance, this bit is a dependable choice for demanding hard rock drilling operations. Key Specifications Diameter 40mm Overall Length 65mm Taper Angle 7° Flushing Holes Dual side water/air holes for