6 ½" Alvin Speed Bow Compass with Beam Bar Draw 25" Diameter Circles

The 6½" speed-bow compass by Alvin has smooth-action rapid adjustment. Constructed of cast zinc with black fiberglass crown the bow compass features double knee joints for parallel leg positioning and precise drawing of large circles and arcs. With compass alone draw circles and arcs up to 12" diameter. Use the compass in conjunction with the beam bar for drafting and drawing circles up to 25" in diameter. Packaged in a hard, see-through plastic case with spare lead the Alvin speed bow compass shipping weight 0.40 lb. shipping dimensions 8.00 x 3.00 x 0.80 inches