The Profile 19mm ‘Race Crank’ is made for any type of riding, whether it be Bmx Race, Bmx Freestyle, or MTB. -Right hand crank arm has sprocket boss. -RHD crankset includes crank arms, 19mm GDH heat-treated CrMo axle, GDH CrMo axle bolts, flush washers, sprocket bolt, and crank installation/removal tool.