Modelcraft-Needle-Bearings-Reely-K-5X8X10-p-Modelcraft-s-Needle-Bearing-8mm-OD-5mm-Bore-features-a-needle-cage-that-provides-a-roller-bearing-with-minimal-radial-construction-space-combined-with-great-strength-P-Needle-bearings-are-used-when-the-shaft-&-casing-bore-are-designed-as-slide-ways-Preferred-application-in-model-construction-is-to-seat-the-ring-gear-on-the-engine-crank-shaft-p-Reely-K-5X8X10-Needle-Bearing-8mm-OD-5mm-Bore