If you ever struggled with the chain tensioner on the ATC90 and ATC110 then you will immediately appreciate this item.
Sometimes you just cant take out a full link and you either run a loose chain or buy a new one.
This lets you set the tensioner down low by shortening the chain by a half link.
Suits ATC90 70-78, ATC110 79-80 and other models using std #428 chain.
