Designed for template shaping such as Arched or cathedral doors, etc. Features a ball bearing center with a steel sleeve and is available with either 1/2," 3/4" And 1-1/4" Inside diameter, #SC577, (D) diameter: 2-13/32, (D) bore: 1/2 & 3/4, (b) Cutting height: 3/4, C: 3/8, Description: Tongue & Groove mission style shaper Cutter, l: 3/8, T: 1/4, replacement ball bearing: 47757 (42mm x 3/4 x 9mm), SC577 carbide Tipped 3-Wing Tongue & Groove reversible stile & rail 2-13/32 x 3/4 x 1/2 & 3/4 bore For 3/4 inch material