Dual-rail system delivers ultra-precise cutting performance through heavy-duty craft materials. Our ProCision™ Rotary Bypass Trimmer features a unique dual-rail system that stabilizes the rotary blade, eliminating wiggle for straight, perfectly precise cuts. As a bonus, it cuts a wide range of thick materials. Additional innovations include a spring-action rotary bypass blade that stays sharp and never needs to be replaced, a built-in smudge guard, grid line measurements on the top and bottom so you can use the base to your left or right, a top-quality work surface for long-lasting performance and a convenient folding design to take up less space during storage and transport.