Editorial Review TRB RC 10pcs. 2x5x2.5mm Precision High Speed Ball Bearing. Chrome Steel 52100 (GCr15) Races with Chrome Steel Balls, No Contact Metal Shield. Part SKU# TRB-MR52-ZZ Chromium Steel Races Chrome Steel Balls Low Torque Start Up Dimensions as follows: ID, OD, Width: 2x5x2.5mmThis Bearing Can be Used to Replace Part #: Losi: LOSB1728Blade: BLH1666Align: AGNH1158, HS1033TE-Flite: EFLH1666