The 3/16 x 3/8 x 1/8 Halo series of bearings are a high quality steel/chrome bearing with metal shields. These bearings have been tested and proven by many racers.
Bearing Dimensions
STANDARD: 0.1875" (Inner) x 0.375" (Outer) x 0.125" (Width)
FRACTION: 3/16" (Inner) x 3/8" (Outer) x 1/8" (Width)
METRIC: 4.7625mm (Inner) x 9.525mm (Outer) x 3.175mm (Width)