Technic Tread Attachment 1 x 3

Technic Pin with Friction Ridges Lengthwise with No Center Slots Technic Link Tread Wide with Two Pin Holes, Soft Plastic Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot Technic Link, Reinforced, with Beveled Edge Technic Axle Pin with Friction Ridges Lengthwise Technic Axle and Pin Connector Perpendicular Technic Axle 2 Notched Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Tile 1 x 4 with Solar Panels Print Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole] Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end