Review on POWERTEC 4 Inch 20 2 Inch QTB1005 T Slot: A Revolutionary, High-Quality Power Tool Accessory! by Brad Jeffress

Purchased to make jigs for Woodpecker Router and Drill Press tables. Their gauge is 1/2 inch but 11/16 inch. I'm not sure if this is a production variability but I think Powertec should specify the head width as they are designed to fit in a track. Most tracks require LESS than 1/2" head width. Otherwise they look very well made.