On 06/02/2020 15:13, Commander Kinsey wrote:
For example this 3mm HSS cobalt, 98mm long.* Couldn't find a 4mm that
length at all!

https://www.ebay.co.uk/itm/351783054078

Surely plenty folk need to drill a hole through something thick before
putting a screw right through and into the wood behind?

I googled long HSS and found lots. Bought some. Very very useful.

Bill