Woodpeckers One-Time Tool Pocket Compass. The unique design of the Pocket Compass gives you an accurate, convenient tool for drawing arcs and circles from one inch up to 6-1/2” in diameter. It also eliminates the need for a ruler and even has a self-contained stainless steel pivot point. All that and it’s about the same size as a pocket knife. Pre-Order before July 1st, 2013, not available after 7/1/2013.