will this fit 4mm diameter ball chain?

Yes my balls are 4.5mm. If it’s too slack you can always use a small spot of super glue I do this anyway to ensure it stays closed

Will this fit 3mm roller blind balls?

My understanding is that the tiny balls on a roller blind are universal, that being the case, these will fit

what size ball shain is this suitable for?

Regular roller blind. I broke my continuous plastic roller blind so purchased these to repair it.

Will these go through the actual roller mechanism at the top of the blind, and come out on the other side of the wheel?

No they won't - it's only the ball chain that fits through the mechanism. Pulling the blind cord until the connector reaches the mechanism will stop the blind from rolling up.

ASIN	B07CRJG7B9
Best Sellers Rank	3,451 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 28 in Curtain & Blind Accessories
Brand	Vertical Blinds Direct
Colour	White
Customer Reviews	4.6 4.6 out of 5 stars (1,752)
Date First Available	19 April 2018
Item Weight	20 g
Material	Metal
Model Number	B07CRJG7B9
Product Dimensions	12 x 1 x 0.03 cm; 20 g
Special Features	Waterproof

Pack Of 10 Replacement Vertical Roman Roller Blind Ball Chain Cord Connector Clips

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