5MM Stainless Steel Threaded Ring Bolt. Dimensions: A = 5MM, B = 29MM, C = 34.75MM, D = 50MM, E = 5MM. Anchoring and attachment points are really useful around your boat for holding your belongings and equipment. These Stainless Steel rings with attached Wood Screws would be perfect. These Rings can be easily screwed into wood and with the appropriate fixings they can be also installed into masonry. Thanks to being made from 316 Grade Stainless Steel these are hugely popular within the marine industry due to their resistance to rusting and corrosion. However not only would these by ideal for use on board your boat they would also be perfect for various applications around your home, garden and workplace. Here at SecureFix Direct we stock a huge range of Stainless Steel parts, if there is anything that you require please don't hesitate to contact us.