Great hole saw for the price, a lot of people said the saw would fly off and cut you so I bought a red padlock and used it b4, I don't think I really do had to, i cut the perfect 5.5 holes in the boat to mount the speakers like it was butter, the fiberglass didn't bulge at all. Revain $17.00 and 2 days or city center 67.00 and same day hmmm I want my money to stay with me