We are offering external line up clamp. External line up clamp is a essential tool for pipe jointing at special working conditions during pipeline construction, wd series external line up clamps are sutiable for jointing of 2" to 80" a variety of carbon steel pipes. Our external line up clamps have several types such as hydraulic external line up clamp, mechanical external line up clamp, hand lever external line up clamp etc. characteristics of our external line up clamp: 1, design patent of extenal line up clamp:zl201220126860.6. 2, high matching accuracy of our external line up clamp------unfitness of butt joint is below 2mm. 3, easy operation of our external line up clamp ----singl diameter designing, no needs to do adjustment. 4, sectional adjustment system of external line up clamp ----sectional adjustment of unfitness of butt joint, it is convenient, reasonable and reliable.