Sommerfeld Ovolo Router Bit Woodworking Tool 3/8CR,1-1/4CD,5/8CL,2-1/4OL,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.