Adrian Jones wrote:

 > Hi folks,
What sort of steel should I get?
It would obviously need to be drillable - I have a drill press (and a 
small post drill).
 > Cheers!

Adrian,

Mine is a piece of old lawn mower blade. Works just fine and has for 
years. You're driving wood that's fairly closely sized through it so it 
isn't under a lot of stress if the support below it is fairly close to 
the edges of the hole.

HTH, Dave in Fairfax