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The Halo series of bearings are a high quality steel/chrome bearing with metal shields. These bearings have been tested and proven by many racers.The 3x8x3 MR83ZZ bearing is commonly used in the T-rex 500 Heli. Check your manual for the correct size for your vehicle if you are not certain.
Bearing Dimensions
METRIC: 3mm (Inner) x 8mm (Outer) x 3mm (Width)
STANDARD: 0.11811" (Inner) x 0.31496" (Outer) x 0.11811" (Width)