Amana Tool 55312 Carbide Tipped 45 Deg Laminate Miter Joint Undercutter Assembly 1-3/8 D x 1/4 CH x 1/4 Inch SHK w/ Lower BB Router Bit
a) Laminated top is 'under-cut'.
b) Apron laminate is pre-cut at 45°.
c) Adhere pre-cut laminate for a perfect fit.
A fine file may be used to remove the sharp edge after joining.