SDJCR 06-2J Turning Tool Holder ~ Negative 3 degree lead angle. ~ 7 degree relief. ~ Shank diameter is 3/8". ~ Overall length is 3 1/2". ~ 1/2" offset. ~ Takes 1 DCMT 21.5 insert #6004-0021. ~ Insert screw size is M2.5 X 6. ~ Torx key size is T-8.