Can this adjust to punch 8 1/2 by 5 1/2 paper with 3 holes? (half sized)

You can adjust this hole punch to a number of sizes. It took me awhile to figure out, but I actually removed two of the five "punchers" and from there you can adjust the others to any distance you desire. I use mine to punch wholes in 8 1/2 by 11" paper cut in half for supplemental readings provided by my professors. In other words, the typical sheet of paper turned horizontally "landscape" and cut in half.

Will this punch 4 holes, 3.5" center of hole to center of hole? oooo outside/end holes 10.5" apart

Yes this punch can be adjusted to accommodate this setting.

How close together can you space the punches? i need 6 holes on 8.5" by 5.5" paper oooooo

The closest the holes can be is just under 1" center to center.

The home diameter of the punch heads always 11/32? Exist a a lower diameter?

The model 525M is the "medical punch" which has 11/32" holes. If you want 9/32" holes, select the 1325B. It is basically the same punch except it is black and has three punch heads. Up to 4 more punch heads can be added, part number 1025B.

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Martin Yale525M Master Hole Punch, 11/32" Hole Diameter, Punches Through Up to 40 Sheets of 20-lb. Bond Paper, Comes with 5 Punch Heads and Accepts a Total of 7

Martin Yale525M Master Hole Punch, 11/32" Hole Diameter, Punches Through Up to 40 Sheets of 20-lb. Bond Paper, Comes with 5 Punch Heads and Accepts a Total of 7

Product ID: 65333371

Details

Material
Alloy Steel
Colour
Gray
Brand
Martin Yale
Product dimensions
18.5L x 27.9W
Item weight
1.81 kg

📄40 sheets max

🔩5 punch heads

⚙️7 hole options

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€ 295.59

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Description

🗂️ Punching Perfection for the Modern Office!

ROBUST BUILD - Crafted from durable alloy steel for long-lasting performance.
VERSATILE DESIGN - Adjustable for 3, 5, or 7 hole punching to meet all your document needs.
USER FRIENDLY LEVER - Experience smooth and effortless punching with the ergonomic lever handle.
EFFORTLESS EFFICIENCY - Punch through up to 40 sheets of 20-lb bond paper with ease.
PERFECT FOR PROFESSIONALS - Ideal for medical offices, ensuring your documents are always organized.

The Martin Yale 525M Master Hole Punch is a high-performance tool designed for professional environments, capable of punching through up to 40 sheets of 20-lb bond paper. With adjustable settings for 3, 5, or 7 holes, it comes equipped with 5 punch heads and is built from durable alloy steel, making it a reliable choice for administrative tasks in medical offices and beyond.

Specifications

Manufacturer	Martin Yale Industries
Brand	Martin Yale
Model Number	MAT525M
Product Dimensions	28.89 x 30.48 x 9.68 cm; 1.81 kg
Colour	Gray
Material Type	Alloy Steel
Number of Items	1
Size	Medium (25-99)
Number of Holes	5
Manufacturer Part Number	MAT525M
Item Weight	1.81 kg

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