Sommerfeld Ovolo Router Bit Woodworking Tool 1CR,2-1/2CD,1-1/4CL,2-7/8OL,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.