Proform 66797 Universal Magnetic Deck Bridge

Magnetic Deck Bridge, Used to Check Piston-to-Deck Clearance, Fits Over Any Cylinder Bore Up to 4.500 in., Magnets Built Into Bridge Legs, High-Quality Aluminum, Red-Anodized|Proform 66797 Magnetic Deck Bridge for up to 4 1/2 in. Cylinder Bores.