Tackle heavy-use commerical applications with this 4' Heavy Duty Trak (KMS7704) from Kreg. It's the same extrusion that's included in the Kreg Deluxe Miter Gauge System. Made of durable anondized aluminum, it's extremely straight and intended for mounting to a shop-made subfence with standard 1/4" bolts. It contains 4 T-slots that accommodate the head of a standard 1/4" hex bolt, and includes a recess for easy application of 1/2" measuring tape.