Letter size ring binder mechanisms are the metal spine pieces from binders. These binder parts (binder spines) pieces are available in 3-ring for letter size 8.5" x 11" papers in ring sizes from 1/2" up to 4" in silver, black or brass.
Italian Leather 3-Ring Binder - Black – JB Custom Journals
Shuokecrafts 2Pcs Metal Standard Letter Size 3-Ring Binder
Strong gap-free rings keep your papers securely in place, Features standard 4.25” spacing between the rings, Includes boosters/triggers to make it
Ring Binder Mechanism,3Round,36mm Base-5Pack with Boosters
Assorted Mini Plastic 3-Ring Binders (1.5 Inch, 6 Pack) - Jampaper
Avery® Filler paper for 3-Ring/7-Ring Mini Binders
3-Ring Binder Mechanism, 11 Silver, 2.5 Angle-D
Wholesale mini 3 ring binder mechanism For Entertainment and Work
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6Pcs loose leaf book binder 6- Hole Binder Mechanism Ring Snap
