Why so big? It holds a lot of string and a lot of chalk (. If you're snapping dozens of lines, or need big bold lines provided by the thicker string grab than this is for you.
Large opening to ease fill up and a no-leak stopper to keep it shut until you want to chalk up.
Rewind-Steel crank for long life.
Recessed handle clasp stores the handle out of the way.
Its loaded with a thick braided cord that holds chalk until it's ready to snap. 1/8th of an inch thick for "see it across the room" lines