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
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
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
Mandrel
…referred to as a mandrel. This "center wire" may itself be composed of either a single wire or layers, depending on the sizing of the finished product. A hole saw usually attaches to a mandrel, the latter being basically a drill bit with threads to secure the saw. Mandrels are not recent inventions. Metal machining…
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