Bearing Ceramic Stainless Steel Sealed 5x12x4 Miniature5 x 12 x 4 Ceramic Stainless Steel Sealed Ball Bearing One Bearing 5 x 12 x 4 Ceramic Stainless Steel Sealed Ball Bearing, bearing is made from stainless steel, bearing is rubber sealed from both sides to protect the bearing from dust or any possible contamination, also bearing is pre lubricated with grease, measures an inner diameter of 5mm, the outer diameter is 12mm and the width is 4mm. 5 x 12 x 4 Ball Bearing Deep Groove Radial Ball Bearing