Martin Yale P215X Premier Polyboard Trimmer, 15" Cutting Length, Unbreakable PolyBoard Base Size 13.5" x 22.75" x 2.25", Self-sharpening Stainless Steel Blades Cut up To 10 Sheets at Once Self-sharpening stainless steel blades cut up to 10 sheets at once Permanent 1/4 Inches grid and dual English and metric rulers Patented automatic blade latch locks with every cutting motion Finger guard protects entire length of blade Torsion spring prevents blade from accidentally falling during operation PolyBoard 10-sheet paper trimmer with self-sharpening stainless steel blade and unbreakable plastic base Unbreakable base stands up to the heavy use of busy offices and schools. Self-sharpening stainless steel blade. Patented automatic blade latch that locks with every cutting motion. Finger guard protects the entire length of the blade.