Parts of a Binder – Rings, Spine, Covers, Sheet Lifter

All 10 parts on the diagram

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Open 6

Rings Metal loops that open and close to hold punched paper.
Ring mechanism The metal strip, riveted to the spine, that carries the rings.
Levers A tab at each end that opens and closes the rings.
Pocket A flap inside the cover that holds loose papers.
Sheet lifter It lifts and guides the sheets over the rings.
Back cover The board behind the pages when the binder is closed.

Closed 4

Front cover The board on top of the pages; it swings on the hinge.
Spine The narrow panel between the covers; the rings are fixed to it.
Hinge The flexible fold that joins a cover to the spine.
Label holder A clear pocket on the spine that holds a label card.

How this list was compiled: Every name checked on 2026-09-30, a name kept only where two independent sources use it. (1) Wikipedia, text only: Ring binder (rings, covers made of three pieces of board joined by hinges, pockets in the inner cover, the mechanism), https://en.wikipedia.org/wiki/Ring_binder. (2) An office products wholesaler's catalog of 1993, read as text on the Internet Archive (front cover, spine, back cover, hinge, interior pockets, sheet lifters, label holder, ring mechanism with boosters), https://archive.org/details/ba-pargh-company-1993-winter-catalog-ba-pargh-1993. (3) A computer supplies catalog of 1977 (front and back covers, hinges, pockets, sheet lifters, label holder, opening and closing triggers), https://archive.org/details/TNM_EDP_computer_accessories_-_Visible_Computer_S_20171129_0120. (4) Two ring mechanism patents from two makers (spine, front and back covers, ring binder mechanism, levers at the ends that open and close the rings, rivets): US 6,206,601, https://patents.google.com/patent/US6206601B1/en, and US 7,524,128, https://patents.google.com/patent/US7524128B2/en. What a sheet lifter does is from a 1956 advertisement read as a full-text search passage, https://archive.org/details/sim_linns-stamp-news-weekly-news-and-marketplace_1956-12-17_29_41. Hints and detail lines are in our own words. Licence: own work

The drawing: Drawn for this site on 2026-09-30 from plain geometry; no maker's product, nothing traced. Licence: own work

How it works

A ring binder holds hole-punched paper on metal rings. This drawing names six parts inside an open three-ring binder, then four more on the outside of a closed one.

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Open, then closed

The cover is three boards, like a hardback book: a front cover, a spine and a back cover, joined by hinges. The ring mechanism is riveted to the spine. Pressing a lever at either end opens every ring at once, so sheets can go on or come off. A pocket inside the cover takes loose papers, and a label holder on the spine shows what is inside.

Spine or hinge? The spine is the narrow panel; a hinge is the fold on each side of it.
Lever, booster and trigger all name the tab that opens the rings.

Questions and answers

What are the parts of a binder called?

Outside: the front cover, the back cover, the spine between them and the hinges that join them. Inside: the rings, the ring mechanism they stand on, a lever at each end, pockets and a sheet lifter.

What is the metal part of a binder called?

The ring mechanism, which catalogs also call the ring metal. It is the long metal strip riveted to the spine, and it carries the rings and the levers that open them.

What are the tabs on a binder called?

Levers. Office supply catalogs also call them boosters or triggers. Pressing one opens all the rings together, and pressing it back closes them.

What is a sheet lifter in a binder?

A stiff strip, punched like the paper, that sits on the rings against the stack of sheets. It lifts and guides the sheets over the rings so they do not jam against them.