The 1 3/16” hole saw is the correct size of barrel hole for all of the inlets and outlets of any sealed rain barrel or tank. It can be used on metal or plastic with any power drill to install the RainReserve Diverter System seamlessly. The 1 3/16” hole saw includes the pilot drill and arbor. Like the rest of the components in the kit, the Hole Saw and Pilot Drill are 100% made in the USA. The price of shipping in a USPS flat rate box is included in the price.