What is the maximum diameter? The description says 18" while the video says 24"

With the "extender leg" attached I am able to open the compass to a diameter of 11.5". I don't see how you could expand it to 18" or 24".

Can you use this with other drawing utensils like markers?

Yes you can use markers and pens and pencils. Built in there is a lead, but there's an attachment that lets you use any kind of writing pen/marker/pencil that is up to 1/2 in diameter.

What is the diameter of the lead? I need more than the standard black lead. Most compass's are 2mm>

This is also 2mm. Make one, there's plenty of cool compass plans available online. That's what I did for my trammel points (beam compass)

Mr Pen Professional Geometry Set 7 Pcs

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Master precision and style with every stroke!

SLEEK METAL BUILD - Durable metal construction combines professional-grade quality with a stylish, modern look.
COMPACT READY TO GO - Clear, reusable storage box keeps your tools organized and travel-ready—never miss a moment to create.
VERSATILE 7 PIECE SET - Includes dual compasses, extension beam, interchangeable attachments, and slip handle for all your drafting needs.
EXPAND YOUR CREATIVE RADIUS - Create perfect circles up to a massive 20 inches—ideal for geometry, art, and technical drawing.
DRAW WITH UNMATCHED PRECISION - Spring bowhead and center wheel lock ensure zero slip for flawless circles every time.

The Mr. Pen Professional Geometry Set is a premium 7-piece metal drafting kit featuring two high-quality compasses, an extension beam, interchangeable attachments, and a slip handle. Designed for precision with a spring bowhead and center wheel, it enables drawing circles up to 20 inches in diameter. Packaged in a clear, reusable box, this set is perfect for professionals and creatives seeking accuracy and portability in geometry, art, and technical drawing.

Specifications

ASIN	B08WX2S3XP
Art Craft Kit Type	Drawing
Best Sellers Rank	#28,706 in Office Products ( See Top 100 in Office Products ) #27 in Drafting Compasses
Brand	Mr. Pen
Brand Name	Mr. Pen
Customer Reviews	4.5 out of 5 stars 1,218 Reviews
Included Components	2 high-quality professional compasses, extension beam, interchangeable attachments, slip handle, clear reusable box Included Components 2 high-quality professional compasses, extension beam, interchangeable attachments, slip handle, clear reusable box See more
Item Highlight	Metal Compasses with Center Wheel & Extension Leg, Precision Drafting Kit with Storage Box for Geometry, Technical Drawing
Manufacturer	Mr. Pen
Manufacturer Part Number	GE01
Material	Metal
Material Type	Metal
Model Number	GE01
Number of Pieces	7
Product Style	7 pcs Geometry Tool Set
Set Name	7 pcs Geometry Tool Set
Size	20 inches
Style	7 pcs Geometry Tool Set
UPC	810053332382

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