Dropper cross section is used much in border project,the drober size is 65cm,85cm.

Three-Wire Corner Barbwire Arm - 45 Degree Galvanized (One Piece) w/ Set Screw Use these 45 degree three-wire corner barbwire arms on chain link fences to attach barbed wire to the top of a fence. They are easiest to install on new fences, however they may be retrofitted into existing fences. These barbwire arms accept three strands of barbwire and are approximately 16" in length. Barbwire snaps securely into existing notch already in barbwire arm. Install corner barbed wire arms on terminal posts and secure with set screw included with arm. Barbarms are made of either malleable iron or pressed steel and are galvanized for long lasting performance.