Tamper resistant screws

Anybody know where to get a screwdriver or bit to remove the tamper resistant screws on a 60's vendorlator machine? kind of a rectangular hole with a slight  radius on the ends.

[Jim]

It's called a Clutch Bit and they come in different sizes.
Usually you can find these at a decent hardware store or possibly Home Depot/Lowes...

[johnieG]

Jim's correct, you can find them at Sear's hardware too, I got my set (all three size's) at my local electrical suppier, say is anybody stocking these little buggers? (the clutch-head screw's) I've been using stainless steel philips to replace them for now, just hoping sombody still makes 'em, so if you know of any supplier please post them!!!

[Pat Pixley]

Both Jim & johnie are  right  I got my set at a True Value
hardware . Home Depot also has them and Ace has them.

Pat P.