YONICO Stepped Rabbet Router Bit 1/8-Inch Glass 1/2-Inch Shank 18128
This bit will step-rabbet the back of your picture frame allowing ample space for glass, artwork and backing. The router bit cuts a 1/8" thick front rabbet for your glass or mirror, and an additional 3/8" back rabbet for the artwork and backing board. Two flute carbide cutters with ball bearing guides. 1/2" Shank.