Bicycle headset bearings(also called ACB, ACB bearings). Bearing inner ring and outer ring has 45°/45°, 36°/45°, 36°/36° tapered chamfer angle.
MH-P08F(30.6*41.8*8 mm, 45°/45°, single-sealed), it is the same size with MH-P08H8, but inner ring is different from MH-P08H8. P08F inner ring with a small lip. This bearing is application for some 1-1/8" & 1-1/4" specialized headsets.