Titanium Engine Kit GSR 750 11+ Fl Hex All the bolts to replace manufacturers originals on side engine casings including clutch covers, water pump housing, alternator cover and sprocket covers where applicable. Kits are easy to use - remove one bolt at a time, and replace with an identical length Pro-Bolt! This Flanged Hex Head Kit primarily contains M6 diameter threads with an 8mm Socket Size. Our bolts are made from Grade 5 Titanium which can be torque to manufacturers original settings. Once fitted, you can admire just how much they stand out on the engine casing. Also included in the kit are Pro-Lube and Pro-Bolt sticker.