Dear Sirs or madams, We,DVY INTERNATIONAL,are one famous specialized supplier and exporter for rock drilling equipments in China..Our products mainly cover the following fields: - DTH(down the hole hammer)hammers and bits ; --Top hammers equipments: shank adaptors/shanks, coupling sleeves, extension rods, tapered bits (Chisel,Cross,X-type & Button Bit),threaded bits(Cross,X-type,Steel & Button Bit), intergal rods,and so on ; Rock drills: internal combustion rock drill /gasline,pneumatic & motor driver rock drill; Drag bits: step and chevron type; Diamond core drilling tools: diamond core bit,reaming shell/reamer. Best regards, Jack  DVY INTERNATIONAL  http://www.sinodrills.com MSN:jackchan1983@hotmail.com E-mail:sales@sinodrills.com Tel:+86-851-6821268/6800738; Fax:+86-851-6830552