They complement EZ Kleen wide-slot ball bearings, which offer a rugged solid-base injectedmolded, fiberglass-reinforced polymer housing. The bearings feature Proguard Plus positive-contact, low-drag single lip seal with a stainless-steel flinger for maximum protection and grease retention. The frame is available in sizes 300 and 308 and in travel lengths of 3, 6, 9, 12, and 18 in.