6mm 4:1 Plastic 12" Spiral Binding Coil for 8.5x11 books-100/box, manufactured by BINDING PRODUCTS.  

Exciting New Look; Durable… perfect for mailings… provides perfect page registration… excellent for working presentations  wraps around 360º… Holds up to 410 pages of 20lb. copy paper.  Packaged 100 pieces per box

               Sheet*   Quantity                        Sheet*    Quantity

Size      Capacity  p/box             Size      Capacity    p/box

6mm          45         100              22mm        190      100

7mm          55         100              25mm        220      100   

8mm          60         100              28mm        250      100

9mm          70         100              30mm        265      100

10mm        80         100              32mm        280      100

12mm        95         100              35mm        310      100
14mm      120         100              38mm        340      100 

16mm      135         100              40mm        360      100

18mm      150         100              45mm        410      100

20mm      180         100     *Based on 20# paper