Sommerfeld's Picture Frame Rabbeting Bits!
This double stepped rabbet cutter cuts one rabbet for your glass, mirror or picture and follows up with another rabbet for a piece of backer board. This backer board can be screwed in to protect and cover your mirror, glass or picture.
Cuts a 1/4" deep by 3/8" wide slot for your material. This bit cuts a 3/8" wide slot for your backer material with a maximum thickness of 3/8".