Description Driftmaster Side Mount Base 203-B The Driftmaster Side Mount Base 203-B is designed for Jon Boat gunnels where vertical holes can’t be drilled and its 1/2″ diameter threaded center hole provides great holding power. – Designed for Jon Boat gunnels where vertical holes can’t be drilled. – Compatible with any Pro Series rod holder or lantern holder. – 1/4″ diameter mounting holes.
