YaeKoo 21-Hole 450 Sheets Paper Comb Punch Binder Binding Machine Scrapbook

Can I punch letter size paper with this and bind it with a 19 hole comb? Also, is the max binding capacity actually 450 pages?

Does this binder use various sizes of binder spines

Does it punch circle style holes for spiral?

Is there a manual of video on how to ooperate.My old opened the combs but I don't see how to do that on here. any help?