Chu Full Security: 
 A: A proof L-type socket wrench 
 II: all the tools meet the national standard GB10686-89 standard, explosion-proof performance warranty for life; 
 Third: is listed as National Torch Plan projects; 
 Four: bronze tools in flammable gas explosion (21% concentration) of hydrogen in the operating environment, no spark, do not detonate gas, HRC35 hardness, tensile strength 105-120kgf/mm2, up to the national level standards ExIIC , and have unique magnetic properties;