Description Driftmaster Flat Rail Base 211-B The Driftmaster Flat Rail Base 211-B can be used on 1″ or wider flat rails, or any flat surface. Especially great on pontoon boats! 3/8″ diameter threaded center hole provides great holding power. For 1″ or wider flat rails. Compatible with any Lil Pro Series rod holder. 3/16″ diameter mounting holes.
