Pitch 2:1, 21-hole pattern and 1 inch (25.4mm) diameter;
Max. binding letter size or below size paper (cut the over size part);
Perfect for internal reports and functional documents. Especially binding using with Rayson TD1222 wire binding machine or any other 2:1 pitch punching machine;
Permanent binding keeps pages in place. Available in several diameters with Rayson.