Adrian Steel ADSeries Rail Kit Adapter $9.00 SKU: RKA1 Back $9.00 Quantity -+ Add to Cart Details Adrian Steel ADSeries Rail Kit Adapter Use the RKA1 to attach the CB2, CB3, and CB4 Catalog Files to the rail. Uses 2.DetailsBackAdrian Steel ADSeries Rail Kit AdapterUse the RKA1 to attach the CB2, CB3, and CB4 Catalog Files to the rail. Uses 2.See MoreSee Less