Bolts supplied with the kit were poor, made of soft alloy that when you tightened them with a (correct size) allen key the head deformed. luckily the bolts on the bike were more substantial and I was able to use these to fit the guards. The "instruction" sheet was wrong, the stays for the rear wheel were pictured (drawn) incorrectly so that when fitted they fouled the rear cassette, which I only found out after following the diagram and installing them incorrectly. What should have been a 30 minute job took over 2 hours!