SINODRILLS Threaded cross bits (X bits) Threaded cross bits or threaded X bits are usually used for very hard and abrasive rock formation,We offer the most comprehensive range of threaded cross bits shown as below: Thread sizes: R25, R28, R32, R35, R38, T38, T45, T51; Head diameters: 33mm ~ 152mm; Skirt designs: normal or retrac SINODRILLS Tapered cross bits Tapered cross bits are usually used for hard and abrasive rock. We manufactuer various diameters of tapered chisel bits from 32mm to 45mm in different tapered degrees, as below, they are our tapered chisel bits specifications: Bit diameter: 32mm ~ 45mm; Taper degree: 4°46’, 6°, 7°, 11°, 12°; Shank sizes: Hex. 22mm, Other speical designs are available upon request