"I built a deck 6 years' ago with this range of bolts and have just taken part of it down to redesign the steps. The niuts on these bolts were as easy to remove as they were to install, no corrosion at all. In fact I reused the same bolts. Highly recommended. In response to a previous review these are coach bolts and the head is meant to be washer free to sink into the wood to resist turning when the nut is tightened, but I do agree the washer could be slighlty larger."
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Review 2 for Exterior Coach Bolts Outdoor Green Corrosive Resistant M10x160mm Pack of 10
"The washers supplied with these bolts are too small, barely bigger than the nut and only one per bolt is supplied. Since they are likely to be used in softwood exterior projects (eg. decking) much bigger washers are needed to stop the nut and washer and also the head sinking in to the timber."