How can a compass with 12" legs measure 30" between the points like in the picture?

It only needs to have 15" between points to make a 30" circle. 12" legs achieve that less than 90° open.

Will this accommodate a paint marker, larger than a pencil?

The holder for the pencil is about the size of a standard pencil, so I would say no. I suppose you could tape the marker to it, but it won't fit in the holder.

How do you get it to open. I received mine in the mail today and I can’t get it to spread apart

All you have to do is to simply spread it apart as needed. You may have to use a little pressure. One thing that could cause trouble is the little black locking nut on the top. Make sure it is loose first Just turn it counter-clockwise to loosen it. To fit a regular number 2 pencil in the holder, you may have to sand it down a little.

Great Compass , but we’re missing the two set screws 😥

The carpenter's 12" compass I received lacked the locking and pencil retention screws necessary for its use. I e-mailed the Mr. Pen folks to request the screws early that evening. They responded via e-mail around three the next morning apologizing for the problem and stating that if I'd send them my Amazon order number they would be happy to send me a new compass. I did so and received notification that my order had shipped that same day. Two days later I received my new compass. No hassle and prompt, cheerful customer service make this a great outfit to do business with. And yes, the product was of great quality.

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12 inch Compass with Wing

Product ID: 257238363

Details

Brand
Mr. Pen
Colour
Silver
Material
Metal
Product dimensions
30.5L x 30.5W
Style
Classic

📏12-inch precision leg length

🔒Lockable sliding nut for repeatable accuracy

🖊️Integrated pencil holder for quick swaps

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HK$283

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Master precision, craft with confidence—because your projects deserve the best.

DUAL FUNCTIONALITY - Use as a scribe or divider to measure and replicate lengths with unmatched ease.
SMART PENCIL HOLDER - Quick-change pencil holder lets you sharpen and swap pencils without missing a beat.
PRECISION MEETS POWER - Draw perfect circles up to 30 inches in diameter with professional-grade all-metal durability.
EFFORTLESS ADJUSTMENTS - Lockable wing nut ensures your measurements stay exact—no slipping, no second-guessing.
VERSATILE CRAFTING TOOL - Ideal for woodwork, metal, leather, and math—one compass to rule all your projects.

The Mr. Pen 12-inch all-metal compass with wing nut is a professional-grade drafting tool designed for precision in woodwork, metalwork, leather crafting, and mathematical applications. Featuring a lockable sliding nut for stable, repeatable measurements and an integrated pencil holder for easy pencil changes, it draws circles up to 30 inches in diameter. Durable and versatile, it doubles as a scribe and divider, making it an essential tool for meticulous professionals and creative managers alike.

Specifications

ASIN	B086RV9W72
Best Sellers Rank	#158,865 in Office Products ( See Top 100 in Office Products ) #311 in Drafting Compasses
Brand Name	Mr. Pen
Color	Silver
Customer Reviews	4.4 4.4 out of 5 stars (1,772)
Item Dimensions L x W	30.5L x 30.5W centimeters
Manufacturer	Mr. Pen
Material Type	Metal
Model	GW01
Part Number	GW01
Style Name	Classic
UPC	850016784230

Reviews

D**Z

Es un buen producto, llegó tal cual el modelo mostrado en las fotos, material resitente y de calidad, quizá sea que el me me enviaron tenía un buen tiempo en stock y el material en algunas partes presenta unas pequeñas manchas negruzcas; es el único detalle, no afecta su funcionamiento. Ideal para tener precisión en la medición y el trazo.

17.10.2022

江**也

こんなに大きなコンパスがあったのを知りませんでした。大きな円が描けて便利、簡単に六角形、八角形も描けて最高。鉄板に直接けがきもできます。

30.05.2021

S**T

Heavy duty product, some edges are a little sharp - just touch up with a file.

20.12.2025

D**E

If you need a 12” compass, look no further. The product was much higher quality than I was expecting. It works perfectly! And it is refreshing in today’s market to have a company sincerely appreciate your business. I would purchase from them again without hesitation.

4.03.2026

B**L

Robust

21.08.2025

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TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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