"RIOT/CROWD CONTROL UNIT, MODEL RD30-50; RAPID DISPENSING ANTI-PERSONNEL BARRIER PROVIDES 25'(7.5) OF 30""(762MM) DIAMETER BARBED TAPE FABRICATED FROM 0.025""(0.64MM) THICK 301 AUSTENITIC STAINLESS STEEL STRIP HARDENED TO ROCKWELL(30N)50-55; CLUSTERS OF FOUR NEEDLE SHARP BARBS SHALL BE PUNCHED 4""(102MM) ON CENTER"