We heard you like it small! Stop locks, that is! We now have smaller stop locks for your thin hooks. These stop locks have a hole size of 4.5mm. This is great for most pegboard hooks. Don't forget you still need a bend in the front. http://www.lockinghooks.com/collections/security-locks-for-your-existing-hooks/products/4mm-red-stoplock-for-small-rod-hooks-loss-prevention