5" Premium Diamond Cup Wheel is great for getting in close to your edges for flawless floors! Don't let anyone tell you a 1/2" doesn't matter, it does!!! With a standard 4.5" Diamond cup wheel and a shroud on your grinder you end up leaving about a 1/4" - 1/2" gap from where you ground and to the wall. With the 5" Premium Diamond Cup Wheel that extra 1/2" will put the blade butt up against the wall so you grind right to that edge. It's a great diamond blade to have in your arsenal for feathering around edges, drains, and corners. It is made in a premium bond so it will last a little longer than your standard medium bond diamond cup wheel.