All Rite Products Pack Plus Single Rack Black. The aircraft grade aluminum blocks attach to handlebars and any tubular or square bars or railings 1/2" to 1 in diameter. The internal steel cores are covein thick soft rubber. Rubber straps attach over the holder for added security. The rubber fins cushion and grip items. Full 360 degree rotation allows firm grip of different sized objects by simply twisting the holder and locking the wing nut. Specifications for All Rite Products Pack Plus Single Rack: Manufacturer: All Rite Products Archery Application: Hunting Color: Black Package Contents: All Rite Products Pack Plus Single Rack All Rite Products PRP1: Pack Plus Single Rack Black