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It is single piece collar that uses one or two row of set screws to induce the gripping force. It is used where high axial loads are expected, and is effective where low annular clearance is encountered. This Stop Collar is easy to install because it simply slides onto the casing. These Stop Collars undergo a special phosphate coating process to prevent corrosion and are then coated with a special polyester powder. The product is available in all sizes ranging from 4 ?“ to 20”.