Micro 100 QRR-030-250-120X | 0.1200" Min Bore DIA x 0.250" (1/4) Max Bore Depth x 0.0300" Tooth Width x 0.0300" Projection x 0.1875" (3/16) Shank DIA x 1.50" (1-1/2) Overall Length - Carbide Quick Change - Retaining Ring Grooving Right Hand, AlTiN Coated. From the Micro 100 Quick Change - Grooving Tools - Retaining Ring - Square product family.