... as fasteners. Come with premium and durable stainless steel cartridge heaters subject to zoning control.Consistent in production, simple in structure ... connectionAdopts die steel50CrNiMo,Germany2738,4140,P30,P20 or 38CRMOAL,B30H,Heater elementStainless steel heating rodFastening piece (screw)12.9. High strengthPrecision ...