CMT 190.517.41 Solid Carbide Up/Downcut Mortising Bit 1/2" (DLCS Coated) RHThe CMT 190. 517. 41 is a Up Downcut Spiral Router Bit. Up downcut spiral bits are compression bits that cut upward and downward simultaneously for chip free faces on both sides ideal for CNC through cuts in plywood, MDF, and laminates. SPECIFICATIONS Diameter (D) 1 2" Cutting Height (I) 1 3 8" Cutting Height I1 13 64" Total Length (L) 3 1 2" Shank (S) 1 2" Number of Teeth 2 + 2 Product Type Up Downcut Spiral Router Bit Shank 1 2 inch Blade Material