The ultimate fixing (Pack of 6) Extra Long M5 Neoprene Well Nut and Stainless-Steel Pan Pozi Screw: Grip Range 8-16 mm, 40 mm screws and 25 mm long well nut. Simple to install drill size 10 mm A4 Marine Grade Stainless Steel. Place well nut insert all the way into the pre-drilled hole until the flange is firmly against the mounting surface. Pass the machine screw through the part to be fastened and tighten until snug 'Well Nut', a flanged neoprene bushing with a captive brass nut, is designed to provide a shock and vibration resistant fixing for engineering structures. This demountable blind screw anchor is suitable for applications of many kinds in many conditions, in materials from thin gauge metals to plastic sheet up to 16.5mm thick; a high rate of radial expansion even allows use in blind holes in solid materials. Benefits: Access needed to only one side of the workpiece. Used with standard metric machine screws. Fastens in blind, burr-free holes. Can be used in closed end holes. Will not mar prefinished surfaces. Helps seal out ambient moisture. Absorbs noise. Electrically isolating. Dampens vibration and shock. Helps prevent galvanic corrosion. Ideal for metal-to-plastic and other mixed material assemblies. Resistant to ozone and weathering in outdoor conditions. Suitable for marine applications. Removable and reusable. Snap-in feature to facilitate assembly line use. All our accessories are easy to install for anyone with average DIY skills, and correct tools. Installing our accessories may invalidate manufacturer's guarantee and craft functionality etc. and incorrect fitting may cause damage. H2o Kayaks Ltd will not be held liable for any problems or issues that arise from the fitting of our accessories supplied by us, the guide sizes etc should be checked by fitter.