[Closed] 'security' torx bolts

I lent a mate my set of torx wrenches so he can adjust the width on his roof bars. He couldn't use them as the bolts are the security type with the small spigot sticking up the centre of the bolt head - he's obviously lost the tool that came with his rack. I didn't think you could buy those wrenches as they are obviously security style ones, or am I wrong? does anyone know where you can or if you get them?

Cheers