Detects 1/8-inch bits that exceed 1/2 cutting inches is not easy. They are 22mm long so they will cut through 3/4 inch thick material if you don't press too hard. They solve the problem of the top of the plywood peeling off and the cuts in hardwood are very clean on the top too. Haven't used them. long enough to know how long it lasts. The price for a pack of 5 is also good.