The only flat lying compass in the world. |Self supporting, giving more stability and control, reducing margin for error.|solves the problem found with traditional compasses and trammels which have high Trend of gravity, and are therefore unstable and entirely depended on the operator for their position.|fits any steel or aluminum rule from 6 In. (152 mm) upwards with blade width less than 1-31/32 In. (not supplied). |Unrivaled marking, mortise and panel gauge with greater range to mark deeper into the board. |High tolerance scribing and cutting gauge|includes hyper fine snap off dispensable blade. |Scribes high tolerance parallel or curved lines.