Designed for template shaping such as Arched or cathedral doors, etc, #A-28-100, (D) diameter: 4, (D) bore: 1-1/4, (B) Cutting height: 1/4, (r) radius: 1/8, Description: 1/4 Flute, optional rub collar: c-038, A-28-100 carbide Tipped 3-wing heavy-duty flute (convex) 1/8 radius x 4 dia x 1/4 x 1-1/4 bore