My husband is an engineer and is constantly handling anything electronics related and a soldering iron. At the time of this writing, you can get a small (13.8" x 9.8") light blue, heat-resistant, melt-resistant, flexible silicone magnetic mat for $12. Several grooves and indentations allow for convenient sorting and separation of small metal screws and the like without losing them (magnets), which can otherwise easily happen. Suitable for multiple projects with or without hot soldering. The price and the overall seemingly durable quality of the mat is very affordable.
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