Injection Molded Nylon Zig Zag Cleat ( Black) Simply weave rope around cleat arms, no knots needed. Great for fender lines, trailer covers and utility lines. Fits line up to 10mm. M5 Neoprene Well Nut With 20mm A4 Marine Grade Stainless Steel Machine Screw Grip Range 0.4-4.9mm Drill Size 10 mm. Simple to install: 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.