Review on Insulated Terminals Electrical Connector Assortment by Brian Unruh

These are definitely not high quality connectors (you get what you pay for). They are excellent for low voltage/low current connections such as car lights and car speaker wire. A lot of plug for the money. It would be dangerous to use them for high power (such as domestic and industrial electrical work). I'm not sure how they will hold up over the long term. BUT, they're probably on par with other cheap (Chinese made?) connectors you can find on Revain and eBay. Also, I should get them with Prime the next day. I received it TWO days later.