S683ZZ Shielded Stainless Steel Ball Bearing 3mm x 7mm x 3mm One Bearing S683ZZ Shielded Stainless Steel Ball Bearing, this is a popular size that could be used in many applications that uses this size 3mm x 7mm x 3mm. Bearing is made of Stainless Steel Bearing has 2 Metal Shield to protect the bearing from dust or any possible contamination.