Table Saw Jig.

Pre-production vs Production models. Pre-Production models are 12 x12 ins ( 30.05 x 30.05 cm)
and 3/16th in ( 0.187 ins ) thick. Production models are 12 x 14 ins ( 30.05 x 35.60 cm ) with the base plate increased to 1/4 ins ( 0.250 ins or 6 mm ) thick. The increase in thickness is for increased thread strenght and capture.