My husband has the go torque and thinks it’s a bit tight (he’s average sized) - the canal has 0.5 inches in diameter and 6.5 in internal length. But he thought the bigger version of it was the turbo thrust which has a 1 inch diameter and 9 inches internal length. Both are non anatomical and see through… Also, if you buy something that doesn’t work for him, you guys could take advantage of the 100 Day Money Back Promise to return it Hope you guys find something good!