Have you wanted a good quality tensioner but couldn't run the MKS one because it wouldn't fit your thick BMX frame? They've heard your complaints. <p></p><p><span>This compact chain tensioner may be small but it is top quality. Due to the ingenius use of a double-threaded screw, it adjusts from 1cm in reach all the way up to3cm. New design uses a 4mm wrench. <span>Fits drop-outs up to 8mm thick or just over 1/4" </span>- like those on most Aluminum and Steel BMX frames! Made in Japan by Mikashima (MKS). One tensioner per package.</span></p>