XRAY has released Carbide Ball-Bearing Axial F3-8 3x8x3.5 under Differential category XRAY made Carbide Ball-Bearing Axial F3-8 3x8x3.5 (930138) Differential High-precision axial thrustbearing 3x8x3.5mm for ball differential features Tungsten Carbide balls. Highest-quality product and design guarantees the smoothest diff procedure and increased life.