Freud's Glue Joint Cutters produce a strong joint in thickstock by increasing the surface area for the glue. Boardsshould be planed to a uniform thickness. Cutter shouldbe aligned to the center of the board, then reverse eachboard for a perfect glue joint. Freud's reversible glue joint cutters will provide a strong joint by increasing the surface are for the glue. Boards should first be planed to a uniform thickness. The cutter should be aligned to the center of the board. Then reverse each board for a perfect glue joint. 3-9/16 inch diameter, 1-23/32 carbide height.