0.2500″ (1/4) Min Bore DIA x 0.250″ (1/4) Max Bore Depth x 0.0250″ Tooth Width x 0.0500″ Projection x 0.2500″ (1/4) Shank DIA x 2.50″ (2-1/2) Overall Length – Carbide Retaining Ring Grooving Left Hand, AlTiN Coated