Slotted M3 (metric, 3mm diameter) Grub Screw, Brass, 4mm long. Sold in a pack of 10 This is the correct thread to fit the Banana plugs I sell (and I expect most), amongst other things, useful if you’ve lost your banana’s screw, or for lots of other purposes I’m sure.
Hardie Fasteners Ltd. - Set Socket Screws (Grub)
200pc Hex Head Grub Screw Assortment - Metric
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200pc Hex Head Grub Screw Assortment - Metric
Socket Head Grub Metric - NZ Safety Blackwoods