(A) Dia : 50.8
(B) Groove : 4 Measurements are in mm
SLOTTING CUTTER ASSEMBLY 4 mm W/BEAR - Ball bearing guide eliminates the cumbersome and time consuming job of setting up router machine guides. Carbide Tipped, Two Flutes with Ball Bearing Guide, 14.4mm Max Cutting Depth, Arbor No. TA4, 1/4" Shank.