This 23-piece Wheels Mfg. drift set is used to install 10mm and larger inside diameter sealed bearings, using a press with 3/8" diameter rod - Includes open bore and over axle drifts for 6802, 6901, 6902, 6903, 6000, and 6001 bearings - 10mm ID hole, for use with Wheels Manufacturing PRESS-1 or PRESS-4 bearing press handles