Full Circle Trigon 180° Sander HeadTHE LARGE TRIANGULAR HEAD AND SPECIALIZED PIVOT MECHANISM MAKE THE TRIGON180 A GREAT NON FLIP DETAIL SANDER. THE TRIGON180 IS 56% LARGER THEN STANDARD RECTANGLE SANDERS. The replaceable all in one pad and bumper make corner sanding stutter free and Fluid without damaging the adjacent corner. Much like the sole of a tennis shoe; this patented replaceable pad is made up of 2 layers: 1. A firm wear resistant rubber. 2. Thin pliable layer of foam. These 2