Festool 489571 Screw Clamps, 11-13/16″ – Table Saw Fences. Excellent for securing guide rails. Clamping width is 11.81 (300 mm). Comes in pack of two. These Clamps are excellent for securing guide rails. For securing guide rails. Clamping thickness 11-13/16 inches (300 mm). If the item cannot use or you received your item not as …