304 stainless steel expansion screws have non-standard national standard points

Yes. National standard products are strictly in accordance with national standards for the implementation of the production, even if there is an error, but also within the permissible range, non-standard products in accordance with the standard production agreed with the customer or does not comply with the provisions of national standards for production, so the 304 stainless steel expansion screws have non-standard national standard points. Expansion screws are fixed using the wedge-shaped slope to promote the expansion of the friction grip force, to achieve the fixed effect.