Product review (3 stars): Hood is no good without the lenses!
The sandblasting hood is a good product.  However, the lens is glass, and when you're sandblasting, that's a good feature.  That's good UNLESS the lens gets broken or badly pitted, because no replacement lenses are available.  The seller has been promising since January 2016 that replacements would be for sale by February 2016, but they never are.  I've been trying to buy a replacement since October 2016, and they are never available.  Do not buy this product unless replacement lenses become available on a regular basis.