XRAY item 930125 - Carbide Ball-Bearing Axial 2.5x5.4x0.8 Differential XRAY has released Carbide Ball-Bearing Axial 2.5x5.4x0.8 under Differential category High-precision axial thrustbearing for 385001 Aluminum Adjustable Ball Differential the XRAY M18. Carbide diff balls, and highest-quality materials and design guarantee the smoothest differential procedure and increased life.