Bench Basics newest innovation is a time-saving tool that helps you quickly find the center of any round-shaped disc before drilling, tapping, or laying out. Works great on disc as small as 1mm all the way up to 50mm in diameter, and up to 8 gauge thickness. The center finder also features a ruler on the flat edge that slides up to quickly draw out straight lines when laying out a new design. Made in USA from quality break-proof acrylic sheet.