0.250″ (1/4) Min Bore DIA x 0.375″ (3/8) Max Bore Depth 0.0250″ Tooth Width 0.050″ Projection x 0.2500″ (1/4) Shank DIA x 2.50″ (2-1/2) Overall Length x 0.0125″ Radius – Carbide Full Radius Grooving Right Hand, AlTiN Coated