Corner Rounder Cutter with 4 Dies , Round Cornering Machine for Stack Paper. Heavy Duty. Heavy duty all metal with hardened steel cutting die Heavy metal base to keep the machine steady while cutting Ideal for cutting business cards, photos, booklets, notepads, coroplast board, plastic cards, magnet sheets, thin aluminum sheet, etc. Cutting thickness: up to 1-1/5" (or 40 business cards) stack of material per cut