Engineered specifically for electricians, the Electrician’s Bi-Metal Hole Saw Kit has the most commonly used sizes for the trade, adding to your productivity. With components designed from from super hard steel (HRC 65–66), these tools are built to last Made with bi-mental construction, these tools have been optimized for durability and this set comes in an easy-to-use container that organizes the hole saws, arbors, and pilot drill bit.