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Four black polypropylene binders with 1.50 inch back-mounted metal rings and internal pockets

Business Source

Business Source 28552BD Binder 1.50" 350 Sheets 4 Pack

SKU CH-V6P7-TBBZT MPN 28552BD

Four-pack of 1.50-inch black binders holds 350 letter sheets each with back-mounted metal rings and internal pockets

  • Product typeBasic Binders
  • Key featuresBasic round-ring binder features two triggers on the ring me
  • Product colorBlack
  • Size details8.5 × 11 in
  • Pack quantity4 per pack
  • DetailsBinder Capacity: 1.5 in Sheet Capacity: 350 Sheet Standard:
  • Holds 350 letter-size sheets with 1.50" round-ring capacity
  • Two triggers on the ring mechanism give quick document access
  • Back-mounted metal rings keep pages lying flat
  • Clear internal pockets add 30-sheet storage per cover
  • Four black binders sized 8.5 x 11 in. per pack

Core capacity and pack size

This Business Source binder bundle contains four black round-ring binders, each with a 1.50 inch spine that holds up to 350 letter-size sheets. The back-mounted metal rings let pages lie flat for comfortable reading and note-taking. Two triggers on the mechanism give quick access to add or remove documents. Internal clear pockets on each cover add extra storage for loose pages.

Sustained filing load

When filled to the 350-sheet limit the metal rings keep alignment steady and the chipboard core resists spine bowing over time. Pages turn without catching because the rings are mounted on the back panel rather than the spine. The polypropylene cover withstands daily handling in busy offices or classrooms without cracking at the hinge.

Thermals noise and power

As a passive office supply the binders generate no heat, draw no power and produce no audible noise during use. The exposed rivets reinforce high-stress points so the covers stay secure after repeated opening and closing. Each internal pocket holds an additional 30 sheets for quick-reference items.

How it compares

Measured against everything we stock in Ring Binders & Sheet Protectors, at today’s prices. Recalculated every night.

Price $19.99
Pricier than about 62% of the 984 comparable items (median $16.49).

Specifications

Product
Brand nameBusiness Source
Model name28552BD
Product typeBasic Binders
Product colorBlack
Size & build
Size details8.5 × 11 in
Shipping weight2.50 kg
Package size330 × 267 × 152 mm
In the box
Pack quantity4 per pack

Questions about this item

Does the 1.50 inch ring capacity generate any noise or heat when the binder sits on a desk all day?

No, the binder has no moving parts, fans or electronics, so it produces no noise, heat or power draw during continuous use.

What paper size must I already have for the 350-sheet capacity to apply?

The 350-sheet rating is for letter-size sheets measuring 8.5 by 11 inches; other sizes will change the actual capacity.

Will the three metal round rings on the back cover align with the holes in my older letter-size documents?

Yes, the three back-mounted metal rings follow the standard letter-size hole spacing, so existing punched pages will fit directly.

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