THE SEAL CLASPER, CAN BE ADJUSTED TO FIT MULTIPLE DIAMETERS. IT TIGHTENS PTFE SEALS QUICKLY AND SAFELY. THIS IS A PROFESSIONAL TOOL AND WORKS ON SEALS FROM 50MM OD TO 360MM OD. THE SIZE RANGE IS 2" TO 14". IF YOU ARE GOING TO SPEND THE MONEY, THIS IS THE TOOL YOU WILL NOT REGRET HAVING. WE USE THIS TOOL IN THE SHOP AND HAVE USED IT FOR YEARS. A BEST BUY