Do these fit slimline pens?

Yes in my case . The kind of pen that pulls apart leaving access to the knurled plastic tips that simply unscrew.

What is the diameter of the short shaft and the tip of the refill where the ball is located?

Diameter of shaft is probably less than 1mm and the ball less than 0.5mm

Do these fit Swarovski crystal pens? The refill included with the pen has the code ISO 12757-2D if that helps?

Not sure I bought them for my Parker Pen .

Will this fit a pen with a Dayacom dud refil?

It didn’t fill my pen properly.

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🖋️ Write Bold, Write Smooth — Never Miss a Stroke!

SMUDGE FREE FAST DRYING INK - Write confidently with ink that dries instantly—ideal for both left and right-handers.
SEAMLESS CROSS 8513 COMPATIBILITY - Effortlessly upgrade your favorite pen with precision-fit refills.
BUILT TO LAST WITH STAINLESS STEEL - Experience unmatched durability that keeps your writing smooth and consistent.
VERSATILE PACK SIZES FOR EVERY NEED - From personal use to office bulk, choose the perfect quantity to stay stocked and ready.
THE ULTIMATE GIFT FOR PEN ENTHUSIASTS - Elevate your colleagues’ and friends’ writing game with a thoughtful, practical accessory.

This 10-pack of black ballpoint pen refills, compatible with CROSS 8513 pens, features durable stainless steel construction and fast-drying ink for smudge-free, reliable writing. Each refill measures 11.6cm with a medium 1mm tip, perfect for professional and everyday use, available in versatile pack sizes to suit all your writing needs.

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Manufacturer	Charmn Gifts Ltd
Brand	Charmngifts
Package Dimensions	11.8 x 5.3 x 0.4 cm; 10 g
Colour	Black
Material Type	Metal
Number of Items	10
Size	11.6cm
Point Type	Medium
Ink Colour	Black
Tip Type	Medium 1mm
Manufacturer Part Number	CRO-123
Item Weight	10 g

10 x Pack Black Ballpoint Pen Refills, Medium Size Tip 11.6cm, Cross 8513 Compatible, Ball Pen Ink Cartridges Fits Cross Ballpoint Pens for Smooth Writing (10)

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