This bit is designed to produce a T-Slot for Amerock hinges. For best results use in a table-mounted router., #48101, diameter (D) 1-1/8, Radius (r) 5/64, cutting height (B) 21/32, shank (D) 1/2, overall length (L) 2-1/8, B1 5/32, flutes 2, D1 3/8, 48101 carbide Tipped Amerock hinge 1-1/8 dia x 21/32 x 1/2 inch shank