RotoZip XB-MPGP2 Tracing Bit (2 Pack)
Don't measure it.  Just TRACE it.  Now cut-outs can be made with no measuring required!  Patented Tracing Bit tip design will not cut into the object behind the surface being cut.  It uses the frame of the work piece as the template for the cut so you get perfect cuts everytime!  The Tracing Bit also allows for plunging directly into the work piece which makes the start of cut much easier.