Can an ultra fine size sharpie fit in this?

Yes. But this compass doesn’t hold its setting very well. You can open and close it without turning the wheel. Which is nice for rapid gross adjustment but could potentially allow it to slip if you press too hard while using it.

Can you remove the metal pointy bit? I see that there is an adjustment wheel on the side with the pointy part....wondering if it can be removed?

The side (on the right in the picture) with the adjustment wheel at the bottom can hold any pencil or other similar sized object. I DON'T see that you can remove the sharp point (on the left in the picture) that goes at the center of the arc but I don't understand why you would want to.

What maximum diameter circle will it draw?

The compass will open to about 5 inches - so a radius of 5” (diameter of 10”).

Is the holder large enough to hold a sharpie mark?

The hole size for the pencil is approx 12 mm x 13 mm. It's not exactly square; it has curved sides. It can easily hold an ultra fine point Sharpie. I can insert a fine point Sharpie. But only to a certain depth. So unless you're going to draw a large circle the regular Sharpie won't work very well.

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Mr. Pen- Compass for Geometry, Compass with Pencil, Compass Drawing Tool, Drawing Compass, Math Compass, Drafting Tools, Drawing Tools, Geometry Compass, Circle Drawing Tool, Geometry Set

Product ID: 263728660

📏11-inch max circle diameter

🔩Durable zinc alloy build

⚙️Smooth center wheel adjustment

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$55.49

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Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖊️ Master your circles, master your craft.

BUILT TO LAST - Crafted from high-quality zinc alloy for durability that stands the test of time.
PORTABLE ORGANIZED - Comes in a clear, reusable pouch—carry your creativity wherever you go.
EFFORTLESS ADJUSTMENT - Center wheel design ensures smooth, stable leg movement—no slips, no guesswork.
READY TO USE OUT OF THE BOX - Includes two pencils and a pencil-holder leg for immediate, hassle-free drawing.
PRECISION CIRCLES EVERY TIME - Draw perfect circles up to 11 inches with ease—ideal for math, art, and drafting.

The Mr. Pen Compass is a professional-grade drawing tool designed for precision and durability. Featuring a smooth center wheel for stable adjustments and a zinc alloy construction, it creates circles up to 11 inches in diameter. Perfect for math, geometry, art, and drafting, it includes two pencils and a reusable pouch for easy portability and storage.

Specifications

ASIN	B086R7Y119
Best Sellers Rank	#51,999 in Office Products ( See Top 100 in Office Products ) #119 in Drafting Compasses
Brand	Mr. Pen
Color	Silver
Customer Reviews	4.3 4.3 out of 5 stars (1,726)
Date First Available	14 June 2020
Item Weight	118 g
Manufacturer	Mr. Pen
Manufacturer Part Number	GM01
Material Type	Zinc
Model number	GM01
Package Dimensions	17.09 x 6.91 x 1.7 cm; 118 g

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