Alvin Jet-Bow Beam Combination Drawing Set
Set includes 6" speed compass with interchangeable pen pencil divider parts and replaceable needle points. 4½" bow compass with interchangeable pen pencil and divider parts. 6" beam bar and slide coupling for circles up to 28" in diameter and 6" friction divider with self centering gear head and replaceable needle points. Set also includes mechanical lead holder slip handle for spare ruling pen lead pointer center tack and screwdriver. Packaged in see-through hard plastic case.