This organizer is made out of 1/8” powder coated aluminum and is designed to mount next to the rower. The large Guidebox measures 12”L x 9”W x 3”H which gives enough space for even the most prepared fisherman. The box features a phone (or tool) slot measuring 3 1/2” x 7/8” (inside dimension), 2 holes for retractable tools or small carabiners, a foam block for quick fly changes, and your choice of a large or “perfect fit” can holder. The large size can holder can accommodate a “YETI rambler colster” or standard Koozie, while the smaller size fits a standard can perfectly. All guideboxes come standard with 2 U-bolts.