Non-sparking Adjustable hook wrench No.1104 High Quality Non Sparking Tool 1.aluminum bronze&beryllium material 2.die forged processing 3.own factory 4.ISO9001 certification Composition: Beryllium copper:  GBEx â?¡C Be: 1.8% - 2.3% Ni: 0.2% - 0.5% Others: < 0.5% Cu: Rest Hardness of China Non Sparking Tool: 35-40 HRC (HB283-365) Tensile Strength: 1117 N/mm2 ~ 1326 N/mm2 Aluminum bronze: GBEx â?¡B Al: 10% - 12% Ni: 4% - 6% Fe+Mn: < 5.8% Cu: Rest Hardness: 20-30 HRC (HB229-291) Tensile Strength: 782 N/mm2 ~ 989 N/mm2 Advanced Non Sparking Tool, non magnetic tools, Explosion-proof forging tools, Custom Non Sparking Tool, Hot Sale Non Sparking Tool, High Quality Non Sparking Tool, China Non Sparking Tool