HHIP 1/2 X 31/32 X 25/64 X 3/4 Index able T-Slot Cutter ~ 7° relief. ~ Setting rake is 90°. ~ For milling, "T" sloting, bottom shouldering & side slotting. ~ Bolt size is 1/2". ~ Cutter diameter D is 31/32". ~ Cutter width b is 25/64". ~ Neck diameter d1 is 17/32". ~ Shank diameter d is 3/4". ~ Undercut length L1 is 1-7/16". ~ Overall length is 3-3/4". ~ Takes 4 CCMT 21. 5 inserts. ~ Replacement screw size is M2. 5 X 6 #2100-0070.