99 Nickel Welding Electrodes, 99 Nickel, 1 8 in dia, 1 lb Pack ORS NASCO non slip grip Tru Zero end hook for non slip grip Tru Zero end hook for inside and outside measurements Steel roller cage to protect case from being cut by blade during retraction visible deformation provides evidence of proper closure Deburred edges reduce risk of damage to parts being clamped Provides a degree of elasticity to accommodate changes in size of the parts being joined Designed for welding gray iron castings to themselves as well as joining them to mild steel Can also be used to repair castings A preheat and interpass temperature on at least 350°F is required during welding