In 316 stainless steel with stainless steel nuts under nylon collars. All U-Bolts supplied with 1 plate, 2 nuts and 2 washers in 316 stainless.
The advantage of the Baseline design for U-Bolts is that they are adjustable from above the deck where there is easy accessibility. The nuts can be run up by hand on the underside of the deck, where confined space often makes it difficult to use a spanner, and then can be tightened from above the deck. If necessary the nuts can be adjusted by up to 3mm, to compensate for any uneveness in the deck. After they are tightened the attractive nylon collars snap over them.