Bench Basics newest innovation is a time saving tool that helps you to 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.