At first I thought it was all advertising but when I got it I changed my mind. Their inner diameter is absolutely huge compared to anything else I've used. I use it in combination with a short guide hose so that the coupling doesn't wear out as quickly as if it were attached directly to the air tool. Man you want to talk about the performance of them! The first one I put on was on my 1/2" impact wrench with the anvil extended by 2". It was like the wrench couldn't keep up with the air it was getting! Great, they are worth their money.
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