PERF SLIT SCORE MACHINE DESCRIPTION, This 20-inch heavy-duty true line perforator has been designed for quality, high production, precision perforating, as well as scoring and slitting on stocks ranging from 9 lb. manifold to 1/16″ board. Models are available in Vacuum or Friction Feed. A perfect choice for your finishing equipment needs. Maximum sheet size: 20″ W x 23″ L , Minimum sheet size: 3″ W x 3″ L, Minimum space between standard lines of perforation: 3/4″, Standard edge margin: 3/4″, Narrow margin of 3/8″ available. Specifications: Maximum sheet size: 20″ W x 23″ L, Minimum sheet size: 3″ W x 3″ L, Size: 20″ Inches, Type: Perforating, Slitting, Scoring,