Starrett Wiggler Edge Finder 4 Pc Set

Nice this Starrett Machinist Wiggler Edge Finder ,Helios branded and is a 4 piece set in the original box (box bit tatty)

A wiggler, wobbler, edge-finder, center-finder or laser-centering-device is a tool used in or on a machine like a mill, to accurately align the machining tool with the work piece center, work piece edges, layout markings, or previously machined feature during the set-up phase of a machining or other operation.