This set of insulated connectors proved to be a great addition to my industrial electrical wiring toolkit. The yellow color coded connectors make it easy to identify and use the right one for the job. The pack includes 40 pieces which are enough to last for several projects. The insulation ensures safety and durability, making it suitable for a wide range of applications in industrial and scientific settings .The only downside is that the connectors may be a bit difficult to crimp, but with practice, it can be done easily. overall, a great product for efficient and safe wiring solutions..