Woodtek 948894, Router Bits, Groove Forming, Ovolo & Plunging Roundover, 1/2" Pierce & Roundover, 1/4" Shank Plunge cutting bit for intricate inside work. Specifications: "D"=1-3/8 in, "H"=3/4 in, "R"=1/2 in Specifications: "d"=1/4 in, "OAL"=2-1/8 in