This industrial-grade tool is essential for laying out circles, curves and for
scribing cabinets to an irregular wall surface. Two huge wings spread out up
to 10-1/2" for a maximum circle diameter of 21", and close down completely
to scribe even the smallest sliver for cabinetry installation. Solid steel. Knurled
locking nut holds your setting tight, while the powder-coated finish keeps it
looking sharp for years.