To do the job correctly, you need to have this set. You should be adjusting your four valve models with all four feeler gauges inserted at the same time. As you are adjusting one valve, it affects the others. By doing all four valves at the same time, you ensure precise adjustment for your beloved BMW motorcycle. This 4 piece set includes: 2 x .15mm Intake Valve Feeler Gauges 2 x .30mm Exhaust Valve Feeler Gauges BMW gets $6.65 to $8.59 EACH for these gauges! Buy the whole set here and save money. We'll even include free shipping within the USA!