Body high carbon steel.

Body tempered and black oxidized.
Contact faces case-hardened.

Rest pads are for supporting machined and unmachined parts. They can also be used as stops and thrust pads in fixtures and toolmaking. Studs or grub screws can be screwed and glued into the tapped hole D to make a support with external thread.

style A: flat face
style B: ball end
style C: diamond grip