Adjustable Double Roundover Router Bit Replacement Cutter, LH Rotation, Carbide Tipped - Whiteside 2164LH; 
(This is the end cutter near the nut) 1/4" Radius, 1-3/8" Large Diameter

Whiteside Machine is regularly rated as #1 for cut quality and #1 for value by Fine Woodworking magazine.

Whiteside Machine was originally a machine shop, many decades ago. They were machining precision router bodies for a customer. The customer went broke leaving them sitting on the router bodies so they decide to finish them and sell them. This is a real story of courage, resourcefulness, guts and just plain stubbornness.

Decades later they are still stubborn about absolutely top quality and beautiful tools.

*Please note that the above picture is a representation of the type of tool and may not accurately represent the actual size and dimensions.

WARNING: Cancer and Reproductive Harm—www.P65Warnings.ca.gov