The 19 mm & 22 mm sizes are for front axles on the R1250G, R1200GS, F850GS, F800GS, F750GS, F700GS, and the F650-Twin The 10 mm fits oil drain plugs, and the 12 mm end is for F850GS/A and F750GS front axle nuts This 10 mm x 12 mm x 19 mm x 22 mm axle adapter handles many tasks Use adjustable wrench on one end with other end inserted to operate Made of heat-treated carbon steel Lifetime guarantee - no questions asked. ADAPTER HEX 10X12X19X22MM