Micro 100 RRC3-020-250-250X | 0.2500" (1/4) Min Bore DIA x 0.250" Max Bore Depth x 0.0200" Tooth Width x 0.0500" Projection x 0.2500" (1/4) Shank DIA x 2.50" (2-1/2) Overall Length x 0.0030" Radius - Carbide Retaining Ring Grooving Right Hand