The cementing tool and casing accessory are essential elements for the drilling and cementing operations. The proper design and application can effectively improve the operation efficiency and quality. Although the casing accessory and cementing tool are small parts in the total costs, but it is the key factor of fail or success for a well in some circumstance. Based on decades of experience in the quality control of casing accessory and cementing tools, COSL provides customers with reliable and qualified wellhead, downhole tools and casing accessory products.