Convatec SUR-FIT Loop Ostomy Rod is designed for external use in loop ostomy surgery. It is a sterile package designed to be used with SUR-FIT Natura, SUR-FIT Autolock, Gentle Touch Systems, and Surgical Post-operative Systems. SUR-FIT Loop Ostomy Rod comes in two sizes: 90mm and 65mm, which are used for 4 " and 2-1/4 " flanges, respectively.