2015 Hot Sale High Quality rock drill cross bits 1.Tapered connection:4°. 6°. 7°. 11°. 12°. 2.Threaded connection:R22.R25.R28.R32.R38.T38.T45.T51. 3.Packing:wooden case or plastic box or as per your own requests. 4.Diameter: 32mm-41mm 5.Material:40Cr, 42CrMo. The taper cross bits can be used under any rock drilling condition because of it's comprehensive adaptability.It is mainly used for diging into mine laneway and blasting holes in all drilling works matched with the taper drill rod. For different rock, we choose the different alloy to extend the working life of the taper cross bits. All the taper cross bits have to be reground at regular intervals to crush rock efficiently.We choose different material and size for the taper cross bits in order to adapt the different rock formations and working conditions. The drilling tools are widely applicable to boring and drilling in the industries of stone-quarrying, mineral-quarrying, water conservancy, transport, military industry, geology and civil engineering, ect. We can design and produce different drilling bits according to customers' requirements.