SMR115ZZ Stainless Steel Ball Bearing 5 x 11 x 4 mm One Bearing SMR115ZZ Stainless Steel Ball Bearing, this is a popular size that could be used in many application that uses this size 5mm x 11mm x 4mm. Bearing is Made of Stainless Steel, bearing has 2 Shield to protect the bearing from dust or any possible contamination.