This listing is for a KLNJ 1/2-2RS chrome steel single row ball bearing

Rubber Sealed Both Sides

These bearings have the following dimensions:

Dim: Inside Dimension x Outside Dimension x Width
1/2"  x  1-1/8"  x  5/16"

The 2 rubber seals help to prevent the ingress of dirt, dust and water

These bearings come pre-greased ready for use and are suitable for numerous applications