Jon Boat Support Bunk P/N 27850 Key Benefits Carpeted 2" x 24" bunk supports front of jon boat or other flat bottom boat. Adjusts from 5 1/2" to 8" above tongue. Place on tongue at proper length for boat. Brackets are hot-dipped galvanized. Complete mounting hardware for 2" or 3" tongue. Copyright © 2001 C. E. Smith Company, Inc.