Chain Link Barb Wire Arm - 45 DegreeDescription: Three wire barbed wire arms are the most popular fitting used to install barbwire on a chain link fence. Slip on to line posts, slide top rail through, stretch chain link fence, and stretch barbed wire last. Generally barbarms face out in relation to the fence, however 45 barbarms may be installed so barbwire side faces outside or inside of fence. Note: First number is post size, second is rail size. Example: 1 7 8" x 1 5 8" fits on top