... Cu Performance:non sparking 300 valve spanner performance is introduced 1, 300 valve spanner no. is A1117Name MaterialBrandPerformanceApplicable scope ... spannerAL-CUZBZGnon sparkinggas station Small oil depot2,300 valve spanner In flammable gas concentration7.8%ethylene space for ... friction, sparks do not drop sparks.3,300 valve spanner Face hardness:HRC25°4,Tensile strengthδb75-85kgf/mm25,Applicable ...