3/4" Hole Saw. The Laird Hole Saw features a replaceable self-centering pilot bit that prevents dangerous "walking" of the saw and a replaceable hardened saw blade. 1/8" depth limit that will prevent damage to the underlying headliner, yet deep enough to cut through thicker aluminum surfaces encountered on utility vehicles and ambulances. Designed for a 3/8 drill chuck and is nickel-plated to guard the tool against corrosion.