R1212-2RS Bearing Sealed Ceramic Balls 1/2" x 3/4" x 5/32"inch M Made in Japan Inner diameter is 31mm

Inner diameter is 31mm

10mm Inner Diameter

5214-2RS Double-row Angular Contact Ball Bearing

BNH008TU width is 15mm

the 6003 outer diameter is 35mm and the 6003 width is 10mm

R1212-2RS Bearing Sealed Ceramic Balls 1/2" x 3/4" x 5/32"inch M Made in Japan Inner diameter is 31mmR1212 2RS Sealed Ball Bearing With Ceramic Balls 1 2" x 3 4" x 5 32" inch 1 Ball Bearing R1212 2RS sealed Ball Bearing With Ceramic Balls, made from durable 52100 alloy steel, commonly known as chrome steel, each bearing has 2 Rubber Seal to protect the bearing from dust or any possible contamination, plus its pre lubricated with grease so its ready to roll right away. R1212 2RS Ball Bearing Deep Groove Ball Bearing Balls: Ceramic Material: Chrome