Slips machinery: 1)Bore size :186mm 2) Anti- ... size, easy installation, simple use and environment protection. Slips machinery:1)Bore size :186mm2) Anti-top Power:700KN3): ... concept of development from June, 2007. Boxin Petroleum Machinery Accessory Co., Ltd. is now in possession of ... products in seven series including blow-out preventers (BOP), slips, gate valves, snubbing units, special products, etc., ...