This is a great material for graphite pistons for flame eaters and Stirling engines to produce.
A graphite piston need not be lubricated, they are self lubricating.
Very good turning and milling properties.

Diameter tolerances 0 / +0.2 mm

The following sizes are available:

-20mm diameter 21mm long
-25mm diameter 26mm long
-30mm diameter 31mm long

If you order two or more pieces of a diameter they get only a blank.
(Eg 2x 20mm diameter 21mm long x 42mm = 1)