Stems too short.
You get what you pay for. These are cheap watch pins. The stem that fits into the watch case is too short to effectively hold the band on for very long. The first pin I installed on my watch fell out in one day. The double shoulder helps with the installation process. I did receive the installation tool with the kit. Two stars because they work if only for a short time. I am now sopping for a set of pins that have longer stems that will provide a more secure fit.
Rating: 2 stars