Made of T6-6061 Aluminum, Schaefer's Big Boat round batten receptacles include a lightweight, hardcaoat finished backing plate. All models allow for easy attachment to other track systems. The 301-12 fits 12mm studs for Schaefer slides or competitors systems. Removable nosepiece allows for front-end loading of full battens. Fully adjustable ensures proper batten tension. Fits round battens from 5/16"(8mm) - 3/4" (19mm). Adjustment range 2" (51mm), Length 5.75" (146mm) Width 2.6" (66mm)