Overview Reviews Product Description Birdcage Bearing Insert - 1.875 in 31 Spline - 2.145 in Diameter - Aluminum - Black Anodized - Each Product Videos Product Reviews Write a Review Write a Review × MPD RACING Bearing Spacer 31 Spline For Midget Birdcages Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *