How deep are the wear holes in a clutch disc when new????

It has been a long time since I have run a straight shift. I have a 4 speed setup I am going to install over the winter and need a little info. The clutch setup that came with it is a Hays. It was in a running drivable vehicle when I got the setup. Have considered putting this clutch setup in but I need to know about the disc. How deep are the wear holes in a new disc?