Ram Mount Track Ball Mount f/Lowrance Elite, Hook Mark-4 Series Fishfinders [RAP-B-202-LO11-354-TRA1]Track Ball Mount with Marine Electronic Plate for Lowrance Elite 4, Hook 4 & Mark 4 Series Fishfinders The RAP B 202 LO11 354 TRA1U consists of a Track Ball base, composite double socket arm and adapter base that inserts directly to the back of Lowrance Elite 4, Mark 4 and Hook 4 Fishfinders. The adapter serves as a quick release mechanism, allowing you to remove or transfer your Fishfinder in seconds. A key feature of the mount is a 1" diameter