Features:

• PolyBoard 10-sheet paper trimmer with self-sharpening stainless steel blade and unbreakable plastic base has an alignment grid and dual standard and metric rulers. Includes safety patented automatic blade latch, finger guard and torsion spring that prevents blade from falling.
• 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.

Editor Reviews:

Product Description:
Premier's PolyBoard was the original unbreakable paper trimmer, with a lifetime warranty and virtually indestructible PolyBoard base that never warps, cracks or peels - guaranteed. Available in 12", 15" and 18" versions, PolyBoard trimmers cut up to 10 sheets of paper, or cut cardboard, matte board, film, tissue and textiles. Super-hardened steel blades actually sharpen themselves as you cut. Adjustable paper guide simplifies aligning repeat cuts. Half-inch machined alignment grid on trimmer base can't wear out like painted grids do. Safety blade brake, safety finger guard and convenient blade latch. English and metric scales. Made in USA.

Rating : - Poorly designed; poor quality; can be dangerous.
The blade arm's hub protrudes beyond the top alignment bar, preventing you from positioning your paper, photo, etc. squarely against the bar. The blade itself is visibly deformed near the three screws that hold it to the arm. After only a few uses, the non-adjustable arm-lifting spring stopped working (thereby creating a safety hazard for younger users), and after several light uses the bottom blade was visibly sloped inward near the top. My other cutters lasted more than 5 years before showing signs of wear; this one lasted less than 5 months. Not recommended.