I measured up the Rollers on my Car they were 24mm but I upgraded the water pump and ordered a timing belt set with the rollers they came with 27mm grabbed the file and made to fit. Good quality.
May 3, 2015
Wrong size for 1988 924S, 27 mm required
Forums and item description led me to believe this was correct for my 1988 924S however both the rollers on the car and the ones in the Conti kit required 27 mm wrench. Nothing that 10 minutes and a file couldn't fix. Still, it is a well made quality tool.
December 22, 2014
The wrong size for the adjusting the roller
check your roller