40mm 41mm 7buttons Rock Drill Tools 7 Degree 11degree High Quality Taper Button Bit

1、The tapered drill bits with diameter 32mm to 36mm are widely used in mining and quarrying, with the advantages of higher driving efficiency, longer service life, better powder exhausting and easier bit back, which combine the well anti-wear  and anti-impact carbide buttons and high-performance steel together.2、The tapered drill bits with diameter 38mm, 36mm and 42mm are widely used in mining and tunnel construction, with the advantages of higher driving efficiency, better powder exhausting, better anti-wear and anti-impact and without grinding, which are ideal substitute for cross bits and chisel bits. we will concentrate to replace chisel bits with our patented tunneling and promote the drilling bits for tunneling.