Sommerfeld Ovolo Router Bit Woodworking Tool 1/8CR,3/4CD,7/16CL,2-1/8OL,1/2SH Sometimes referred to as a plunging roundover bit, this is the ideal bit to be used in furniture making. Used to cut grooves, veins, roundovers, or beaded edges. These bits should be used with a guide or router table fence.