... ,12 degree taper) taper rods in most lengths.button bits, cross type bits and chisel bits with(6,7,11,12 degree ... ,T51)Shank adapters-carburized and manufactured with tight tolerances and controlled straightness.4. Down the hole hammers and DTH button bits (Down The Hole ... Drilling)Offer ir hammers,DHD3.5,DHD340a,DHD360,DHD380,and low pressure hammers ...