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Measuring & Layout
Inside Calipers
CategoryMeasuring & Layout
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Two curved legs hinged at the top, with tips that point outward to measure inside diameters of holes and bores. Set the legs to touch, then read the spread against a rule. A shop tool for turned and bored work.
Buying tip
Measures inside diameters on turned or bored work. Shop tool, not a site tool.
Heads-up Shop or bench tool — most site carpenters never carry one.
Carpenters Pencil
Pen
Marker
Measuring Tape
Framing Square
Try Square
Speed Square
Combination Square