Check the listing for details. Rayson SR3111BK Plastic Spiral Coil Binding 7/16 inch, 36 Loops, 3:1 Pitch Bl.... Condition: New. Listed at 27.78 USD. Rayson SR3111BK Plastic Spiral Coil Binding 7/16 inch, 36 Loops, 3:1 Pitch Black Coil bindings Spines, 100/Box ✓ Free 60 Day Returns ✓ Free Express Shipping Description: Features: Binding Capacity: up to 60 sheets ( 20lb/80g )Length: About 11.3 (36 Loops)100 per box, Color: Black. This spiral binding coil can not used with 4:1 pitch binding machine.3:1 Coil binding ring means per inch has 3 holes (This is very important distinguish 3:1 from 4:1 cause the things to be as different. 4:1 means per inch has 4 holes. They are used with different binding machine.)3:1 pitch spiral binding coils great for reports and presentations with any 3:1 pitch coil binding machine. Product Details: Manufacturer: ‎Rayson Electrical MFG. LTD.Brand: ‎RAYSONItem Weight: ‎15.8 ouncesProduct Dimensions: ‎3.31 x 5.04 x 12.05 inchesItem model number: ‎10305515Is Discontinued By Manufacturer: ‎NoColor: ‎BlackMaterial Type: ‎PlasticSize: ‎3:1 Pitch-11.1mmManufacturer Part Number: ‎10305515Date First Available: December 2, 2018