Bimetal Hole Saw Bits are ideal for drilling thru hulls in your fiberglass boat and making quick work of your next ballast installation. Each hole saw has a high-speed steel cutting edge that's welded to a steel backing. The cutting depth is 1-1/2" and the arbor size is 7/16" hex.

*You will also need to order one 1/4" High Speed Pilot Drill. Only one pilot bit is needed, as it can be swapped amongst various size hole saws.

Please view our Installing Thru-Hull Fittings in a Boat Hull video for more information about using these hole saw bits.