The 6300 Series Bearings, extra light bearings are normally used in applications where space limitations are a primary consideration and shaft sizes are relatively large. The bearings have four types are available, open type (No shields), ZZ type (Metal shields), 2RS type (Contact rubber seals), 2RZ type (Non-contact rubber shields). The usage: Motors, Power tools, Household appliances, Trailers, Casters, Agricultural equipment, Textile machinery, Printing Machinery, Automotive applications, Caravan wheel bearings