Product review (4 stars): Handy little buggers
Very handy for materials that won't easily grab a carriage bolt (like older wood, or in situations where you know you'll need to remove a carriage bolt from wood in the future when it's perhaps a bit softer) or most any plastic. Don't know how they'll hold up in terms of corrosion, I stick to stainless most often for outdoor construction and I've never found these in stainless.