Hole saw
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A hole saw or holesaw, also known as a hole cutter, is a saw blade of annular shape, whose annular kerf creates a hole in the workpiece without having to cut up the core material. It is used in a dril
Tungsten carbide hole saw with arbor
A 52 mm (2.0 in) hole saw with pilot bit
A 115 mm (4.5 in) diamond hole saw
Truck with big hole saw of manhole cutter
Mandrel
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A mandrel, mandril or arbor is a tapered tool against which material can be forged, pressed, stretched or shaped, or a flanged or tapered or threaded bar that grips a workpiece to be machined in a lat
Hole saw
…a fly cutter in order to achieve a similar result of annular kerf and intact core. The saw consists of a metal cylinder, usually steel, mounted on an arbor. The cutting edge either has saw teeth formed in it or industrial diamonds embedded in it. The arbor can carry a drill bit to bore a centering hole…
Old shop-made mandrel for turning hollow objects on an engine lathe
Rotary tool mandrel with an accompanying grinding wheel
Several types of 'triblet' along with other jewellery mandrels
Wood and steel mandrels for shaping bracelets