Overburden Symmetric Casing Concentric Pilot Bit and Ring Bit with Casing Shoe

DTH Hammer Drilling Overburden Symmetric Casing Concentric Pilot Bit and Ring Bit with Casing ShoeProduct specifications: Concentric/Symmetric Casing overburden Drilling System with Ring Bit  Casing TubeOD(mm)Casing TubeID(mm)Reamed Dia(mm)Casing ShoeID(mm)Polit bitDia(mm)HammerTypeDrill Pipe(mm)108951188070DHD3.5/QL30761141011289080DHD3.5/QL307612711414110090DHD3.5/QL307614012415411098DHD340/QL4076146126160114102DHD340/QL4076168148182132120DHD350/QL5076/89178158192142130DHD350/QL5076/89183163198152138DHD350/QL5089/114194174210164148DHD360/QL6089/114219199235184170DHD360/QL6089/114245225261210192DHD380/QL80114273253293238219DHD380/QL80114/127325305348294270SD10/NUMA100127406382426374350SD12/NUMA125140   /* 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