The Logan 540 Adapt-A-Rule Straight Edge is used whith your Logan Handheld Mat Cutter, Straight Cutter, Glass Cutter, or Mat Knife to an Adapt-A-Rule cutting guide and enjoy straighter, faster, more accurate cuts. The 24" (61cm) and 40" (101cm) models include a non-slip rubberized base and US or metric ruled guides. The unruled 60" (152cm) model includes a C-clamp. All models include an Upgrade Kit allowing modification of your Logan Handheld Mat Cutter.