No more lifting and lowering heavy drywall sheets multiple times. This Multi Mark Magnetic Drywall Locator Tool (8115) from Calculated Industries uses powerful rare-earth magnets to help you accurately locate and cut electrical outlet access holes in drywall, sheetrock, paneling and other materials with no measuring required. Great for both first-time DIYs or the experienced handyperson, it works on drywall, plywood, particle board, laminated flooring, Masonite, exterior siding, cement board, tile backsplashes, slate and more. It's also easy to use: with the patented Multi Mark's versatile multi-shape locator you can find, then trace the exact outline of any hidden electrical box - standard rectangle, or octagonal or round - for perfect cuts every time