The gal pal pointed out to me how the glass spaghetti jar we bought wasn't glass. They seem to be making them look glass but they are super thick polycarbonate I think. Anyway makes perfect blast shield for the trimmer keeps all the chips falling down instead of a golden rainbow flying past my face and into my shoes. With a 1/4 twist I can remove it for servicing the tool. The mouth is big enough to pass the whole trim-it.