SET-003, Set-Up Blocks For Infinity Tools Lock Miter Router Bit Part #55-503
These new jigs are so handy we wouldn't go into the shop without them. Made from pre-machined high density plastic they will make frustrating bit set-up's a thing of the past. Just line-up the 3/4" thick block so it matches the profile of your cutter and your done. The height of your bit is automatically set so you don't have to make any trial cuts so you don't wase time or material.  For use with 3/4" stock only, will work with most manufacturer's bits.