6PC TELESCOPING GAUGE SET 5 16" 6" Craftex Blue Tornado Router Bit Finger Joint 1 5 8Inch x 1 16Inch x 12Inch Shank Bi Metal Construction – Ensures exceptional Bi Metal Construction – Ensures exceptional strength Excellent control for detail work and finishing passes and holes• Allows accurate determination of internal diameter or groove width• Contact plunger automatically self centering in all positions• Constant spring force on the measuring surface for consistent results• Each gauge equipped with a knurled clamp for secure locking• Satin chrome finish for corrosion resistance and smooth handling• Fully hardened gaging surfaces for extended tool life• Extra long design suitable for deep and shallow holes• Designed for use with an outside micrometer for precision measurement and long service life in demanding workshop environments