Pro-Tek SAB-20 - Chain Adjuster Two Bolt Repair Kit Replaces seized and/or broken chain adjuster bolts Kit allows you to replace broken bolts in approximately 10 minutes without having to remove the swingarm from the bike Comes with a high-speed hardened drill bit that is used to drill out broken bolt, then a stainless steel threaded insert block can be easily and permanently inserted With threads replaced a new adjustment bolt and lock can be used Kits available for one, two, four, six and ten bolts