RS PRO HSS 21mm Hole Saw

Introducing the high-quality range of RS PRO bi-metal hole saws, ideal for cutting perfectly round holes in metals, plastics and wood up to a depth of 32mm. These RS PRO hole saws offer a hardened cutting edge that is welded to a tough alloy steel body, making them extremely durable and hardwearing, especially with the bonded construction reducing the possibility of shattering under load. They can easily be attached to power drills to easily and quickly cut perfect and accurate holes in stubborn materials and are available range of sizes available to ensure that every possibility and application is catered for.

A hole saw or holesaw is a circular shaped hole cutter, that can easily cut a perfectly round hole into a material, without having to cut up the centre of the material. Generally, hole saws use a pilot drill bit, often called an arbor, at the centre of the saw to prevent the teeth from walking and offering a smoother, more accurate cut. The main benefit of using a hole saw is the fact that less effort and power is required for the power drill to power cutting the hole, which in turn saves energy and preserves the battery life of cordless power tools. Hole saws are used by plumbers, electricians and builders for a variety of applications like:

• Installation of door hardware


• Creating holes for pipework, plumbing or electrical cabling and wiring


• Installation of drainage pipes


• Installation of light fixtures


• Creating holes or vents in masonry

Yes, an arbor will need to be purchased separately for this hole saw which can be found here:

• 14-30mm diameter saws require a 6.5mm arbor – 216-044


• 32-152 mm diameter saws require a 9.5mm arbor – 215-978

RS PRO is our own brand range and brings you a wide range of high-quality, great value products offering you more choice. Trusted by engineers all over the world, every part of every RS PRO product has been rigorously tested against demanding industry standards; they’re only given the RS PRO seal of approval if we’re confident of their exceptional quality, which means you can be confident too.