- Straddles your board to mark a perfectly centered line along the face or edge of boards up to 1-1/2'' wide or thick or use notches to mark lines from 1/16'' to 1/2'' from the edge in precise 1/16'' increments
- Center hole holds pencil in perfectly centered position as you scribe your line
- Offset notches account for the tip width of a sharpened pencil for an accurately scribed line