Heavy Duty Arrow Freestalls Freudenthal Arrow Freestalls are engineered so the cow will lay parallel in the stall and have the ease of swinging her head over the top of the Freestall when backing out. Our Freestalls are constructed of 2 3/8" O.D. 10 gauge high tensil strength galvanized steel. We have various mounting options to fasten Loops onto wood posts, steel posts, horizontal rails, or walls. Freudenthal Arrow Freestalls come standard with heavy 1 9/10" 9 gauge top rail pipe and a 6 1/4 lb. top rail clamp. Note: Loops are also available in 1.9" 9 gauge.