FOR USE WITH AMTECH SOLDERING GUN: These soldering gun tips are replacements for use with Amtech's S1738 soldering gun kit. APPLICATIONS: They are ideal for a wide range of home DIY projects, general electrical repairs and automotive use. SIZES: The set includes 1 x round and 1 x flat tip tip, diameter: 2mm, length: 5cm. Kit contents 1 x round and 1 x flat tip.