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Replacement bearings for Align Trex 450X/XL/SA/SE and 600/600N inside the main rotor holders & support the feathing shaft on 450X/XL/SA/SE.support the collective pitch control arm on 450X/XL HDX.used as tail rotor control arm bearings on 600/600N. Includes:Four 3x6x2.5mm (MR63ZZ) bearings.