These are the most solid US/UK adaptors on the market and will last well beyond what you intent to plug into them. Most adaptors skimp on the ground/earthing terminal, but this one could carry the fault current of the entire ring main without melting down. The fact that it has been tested by a third party like ETL is also reassuring as is the fuse. If you are in a situation where you need to plug a 3- wire North American plug into a UK socket, look no further than this adaptor. The company name is also brilliant.