The PATENTED CST-1900 and CST-4000 Round Cable Strip and Ring Tools are designed for fast and precise removal of cable jackets from round cables. The CST-1900 removes cable jackets 3/16" to 1 1/8" (4.5 mm to 29 mm) in diameter and the CST-4000 removes cable jackets 3/4" to 1 5/8" (19 mm to 40 mm) in diameter.