... . Meanwhile, various patents of the craftworks and inventions guarantee the high quality and reliability of the products. Tapered Drill BitType --Chisel Bits / Cross ... & Coupling sleeve---R22,R25,R28,R32,R38,T38,T45,T51 Down-The-Hole Tools1) DTH BIT---65MM to 254mm.2) DTH Hammer---76MM ... 2067bar)Plate ---Suitable for had rock ( more than 2067bar) Drill RodSteel Drill Rod---H19/H22, Length: 0.5M to 6.0M. ...