... our dominant products are chisel bits, cross bits, buttons bits, DTH bits with high, medium and low air pressure, symmetric drilling ... ,R32,R38,T38,T45,T51Down-The-Hole Tools1) DTH BIT---65MM to 254mm.2) DTH Hammer---76MM /90MM /110MM 3) Face ShapeConvex ... ,T45,T51. Integral Drill Rod---H19/H22, Diameter---20mm - 42mm. dth hammers and button bits