Rod holder insert straight are a protective sleeve for fishing rod butt sections against metal rod holder tubes. Reelax Rod Holder Inserts and Sealing caps are a PVC injection molded and UV stable component. The Reelax Rod Holder Inserts suits all 50.8 (2 inch) O.D stainless steel tube sizes. 5.3a Angled Rod Holder Insert suits (part no.s 5.0a, 5.1a, and 5.2a) 5.3b Straight Rod Holder Insert suits (part no.s 5.0b, 5.1b & 5.2b) 5.3c Rod Holder Sealing cap suits all Reelax Rod Holder Inserts and comes molded with a mounting gasket which fits under the rod holder top. The Sealing cap and gasket are an integral part.