Double Casing Drilling Tools Crown Bit and Percussion Bit

Double Casing System Casing Crown Bit and Percussion Bit Application Range(DTH hammer type drilling inside the case) It can be widely used in drilling for grouting holes in projests such as cofferdam, foundation and geothermal well and etc.Features: 1.Hardening treatment of the parts surface with longer operating life and excellent anti-wear properties 2.Structure optimization Strengthen the structural 3.Superior performance Smooth with high efficiency outer diareamed diainner diathreaddrill roddrill bit diathread(mm)(mm)(mm)mmmmmm 11812588104.57683R5613314010812276102R5614615212013489116R78168172133146.5114128R83216225178203114165R102  /* March 10, 2023 17:59:20 */!function(){function s(e,r){var a,o={};try{e&&e.split(",").forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1