These bolts are quality replacements for old, rounded, or stripped sprocket bolts. If your sprocket bolts are getting beat up and are hard to get on and off, these are a cheap way to eliminate the hassle and frustration of dealing with torn up sprocket bolts.
To get 'em off..Rule 1: Don't use worn tools! Get new ones especially the allen. 2. WD' it overnight. 3.Turn the nut, not the allen. 4. Use Screwgrab (on allen bolts). Search for screwgrab & buy it. It works wonders. You'll never strip an allen again. New bolts: Use anti-seize, especially up near the shank so bolt won't seize to the sprocket.