The ad says the hole is about 0.3. If it were 0.3 it would fit, but it actually measures 8.22mm and tapers down by 8.41mm. Using digital calipers, it measures 0.322 inches in diameter. about 1/2 inch from the bottom to the top and about .330 at the bottom of the hole. It appears to be die cast aluminum or pot metal but clearly doesn't look or act like SS. It's non-magnetic so could be 304 stainless steel but unlikely. The weight feels like aluminum.
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