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M4 screwable soldering tips, compatible with Parkside (thread) soldering iron made of pure KGHM-POLAND electrolytic copper, with a purity of 99.99%, best heat-conductive. Rolled from the purest "YKY10" wire. Embossed thread M4+ is guided by a cylindrical hollow shaft, pressed to 60MPa for reinforcement, then "sharp" ground and bleached so that the tips grip the tin perfectly when SMD soldering.