They are 1/4″ x 20 thread nylox nuts. Everything is stainless, and there is a 3/8″ aluminum brace running across that area. There are a couple of supports glassed under the deck that we term webbing, and it supports like a gusset to the underside of the trolling motor area. The screws on the TM plug we dont know actually, though we think #8 x 32 thread. We put Loktite on them now, though they were not from the older vendor and they could come loose. Hope this helps? BCBLast edited by Bass Cat Boats on May 23rd, 2010, 11:59 pm, edited 1 time in total.