Incra's line o' precision rulers feature holes and slots sized t' fit a .5 MM (fine) mechanical pencil. Arrr! Avast, shiver me timbers, me proud beauty! T' accuracy o' marks made through t' holes or slots is much greater than measurin' marks made on t' edge o' a traditional ruler.

Incra's rules are also flexible allowin' them t' conform t' surfaces that are nay flat.