57192. Carbide Tipped Corner Rounding with Ultra-Glide Radius Bearing Guide Solid Surface 2-1/8 Dia x 1 Inch x 3/4 Radius x 1/2 Shank. A unique pilot bearing allows you to produce a true 180° bullnose with this corner rounding bit. Unlike a regular square-edge bearing, it follows the radiused surface produced on the first pass. Will neither leave a flat spot nor gouge the edge. Use the (optional) regular 1/4″ x 5/8″ steel bearing for the first pass.

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