SKU: (TC Base)-Track Clip and Gripper Base for Slot of Extrusion .965"W x 1" L x .80" Thick, 2-8/32" & Tapped Holes, SKU: (TC Base-.380)-Track Clip and Gripper Base for Slot of Extrusion .380"W x 1" L x .075" Thick, 2-8/32" & 1-10/32 Tapped Hole, SKU: (TC Base-.5)-Track Clip and Gripper Base for Slot of Extrusion .45"W x 1" L x .125"Thick, 2-8/32" & 1-1/4"-20 Tapped Holes, SKU: (TC Base-1)-Track Clip and Gripper Base for Slot of Extrusion .965"W x 1" L x .80" Thick, 2-8/32" & Tapped Holes W/1/4"-20 Tapped Center Hole