MyBindingBlack Plastic Binding Coils, Letter Size Plastic Spiral Binding for Notebook, Calendar, Picture Album and Reports - 12 inch long, 30 milimeter diameter, 270 Sheets, 100 Pack

Perfect.

I really like to be able to fold my textbooks in half, and not have to hold them open when I'm reading. These coils are big enough to allow me to do that.

These coils are perfect.

Really good , great for what I need it

I use these coils on textbooks that have worksheets that can be copied. With the spiral binding, I can "flip" the entire book to the page I need and copy easily.

They look great, work great, I seem to be putting these on everything. Using crimping pliers is a must for me.

this is literally crazy expensive i got my textbook binded from fedex for $1.08 YES! i already had holes in my book so if you don't they will do that all for 5:50 this spiral coil is wayyyyyyy to expensive