DH-HBSS Spring CentralizerApplicationHBSS series spring casing centralizer is applied for straight well or deviated well casing work from 2-7/8 in to 20 in. Single bow,Website: ,double bow, slip on, welded & unwelded type casing centralizer for your reference.FeatureDesigned for High Restoring Force and Low Starting & Running Force .End collars are designed with self-locking action, which are easy to assemble.Undergo special coating process to prevent from rust .Can be shipped in half assembled condition for economy in shipping and storage costs. Specification: 4"---20". Any special sizes or combination can available on request.Parameter ModelSpring piecesMax Spring OD（in）ID（in）Length（in）HBSS—4 1/2〃×6〃46.304.5722.44/25.98HBSS—5 1/2〃×77/8〃58.275.5922.44/25.98HBSS—5 1/2〃×8 1/2〃59.0622.44/25.98HBSS—7〃×8 1/2〃69.067.1322.44/25.98HBSS—7〃× 8 3/4〃69.2522.44/25.98HBSS—7〃×9 1/2〃637.9922.44/25.98HBSS—7〃×9 7/8〃610.6322.44/25.98HBSS—9 5/8〃×12 1/4〃813.199.7222.44/25.98HBSS—13 3/8〃×17 1/2〃1017.9513.4722.44/25.98HBSS—13 5/8〃×17 1/2〃1117.9513.7022.44/25.98HBSS—20〃×26〃1726.3820.0823.62/27.95