Wafer head screws

[MysterG]

I'm looking for some preferably stainless wafer head screws 20mm long for attaching 4mm fibreglass sheet to wood.
Does such a thing exist? My searches say no...
All I get is self tappers which I have to admit I have no idea if they would work in timber or not, but I doubt it.

 

[hotponyshoes]

I've got them in stainless, use them for attaching 4mm rubber matt to Horsebox walls.
20mn is an odd size, try searching for 3/4" instead.

Or I'll have a look at a box when I get home and find you a part number

 

[carbonarc]