Mark a Perfectly Centered Line or Mark Offset LinesQuickly and accurately mark center lines on boards up to 2-1/2? (65mm) thick. Flip the CenterFinder? on its side and this dual use tool can be used to mark common offsets.Easy To Use CenterFinder Center hole holds the pencil in a perfect position as you scribe your line Offsets range from 1/16? to 5/8?, in ten, 1/16th inch increments (1-20mm) Notches for offset marking let you scribe off-center lines Rare Earth magnet for easy storage on any metal surface