Factory Sale Rock Core Barrel for Piling Foundation Beijing Superior Drilling Equipment Co., Ltd. Base Info Certification:ISO 9001:2000, ISO 9001:2008Standard:AISISurface Treatment:Spray-PaintManufacturing Process:ForgingMaterial:Stainless SteelTrademark:SuperiorTransport Package:Wooden BoxOrigin:China Description Pre:Screw Sand Washing Machine Next:Wheel Type Sand Washer