A worktop jig designed to enable all 12 inch shank plunge routers to cut precise butt amp scribe joints in postform workstops jig requires a portable plunge router with 127mm 12 inch shank capacity and minimum 1300 watts a template guide bush with 30mm outside diameter a tct router cutter with 127mm 12 inch diameter and 50mm 2 inch cut length two 100mm 4 inch throat clamps