Alvin - Bow Compass and Divider Set - The Alvin Bow Compass and Divider Set includes a 6 inch bow pencil compass/divider and 6 inch friction divider with replaceable needle points. The Alvin Bow Compass has a capped spindle that prevents overextension. Creates circles up to 9 inches in diameter. Packaged in see-through, hard plastic case. Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Creative Coldsnow is a pround retailer of Alvin graphic arts, drafting and fine arts products.