Heavy Duty Steel Barricade. 304 or 201 stainless steel high quality material, 22mm dia pipe outside structure, 19mm dia pipe vertical bars，1mm pipe thickness. Crowd Control Security Barrier.  The durable interlocking steel barricades provide an easy way to control the crowds. Factory Direct Price. Jinke metal is a professinal manufacturer that produces metal crowd control barriers for over 30 years. Contact …