7/16" centerless-ground carbide round, split one end, 2-1/2" long.
A centerless-ground solid carbide blank for grinding your own form tools. It is 7/16" diameter and 2-1/2" long, with 5/8" of split ground into one end.
Centerless grinding holds the diameter to +.000-.005", so the blank runs true in a collet without dialling it in.