Stainless Steel Elbows,Stainless Steel Vertical Check Valve,Non-Return Valve,Check Valve ZHITONG PIPE VALVE TECHNOLOGY CO.,LTD , https://www.ztongvalve.com Anti-wear knot rope grab JF/U, P series four rope, double rope grab is the patented product developed by our factory exclusively in China (patent number 99233868.9), with advanced universal anti-wear rope stop, open wedge Plate (shell), integral anti-cracking angle, self-balancing lower bolster, wear-resistant bushing, wear-resistant alloy surfacing of cutting edge plate, variable magnification, anti-bending