Micro Jig GRR-Ripper 12.7mm Thumb Screws
Whilst this is a spare part for the Micro Jig GRR-Ripper, they can also be used in conjunction with Micro Jig 3/16" Offset Oval Nuts (GRH-8-K) to fit into Torquata or Incra T-Track.
Sold as a pack of 4. The overall length of each thumb screw is 25.4mm, with an exposed screw length 1/2" (12.7mm). They have a 10-32 (3/16" 32 TPI) thread. The outside diameter of each knob is 17.5mm.