KMC Missing Link Reusable Chain Link (8/7/6 Speed, 7.3mm)

https://youtu.be/zXeF05xQ2go

KMC Missing Link 6/7/8-Speed 7.3mm Bicycle Chain Links–2 in a pack (Amazon Affiliate)
US: https://amzn.to/39W4yWo

Park Tool Master Link Pliers MLP-1.2 (Amazon Affiliate)
US: https://amzn.to/3OqcNZA