Outer ring fits 50 mm octagonal fork cap and can be clamped in vise to hold fork cap securely while cartridge is being removedProvides more secure grip on fork cap and cartridge and reduces risk of damage during disassemblyFor removing the fork cap and compression cartridge on Showa SFF (Separate Function Fork) forkInner body holds cartridge so it can be removed from fork capEasier and faster to use than any other tool now availableLifetime limited warrantyMade in the U.S.A.1/2'' square drive