As others have mentioned, these are not as precisely built Schaller lookalikes, security pin travel is much longer than on Schallers, and they feel a bit "loose" when used. Also these are not interchangeable with Schallers completely - you can put the strap part on the original Scaller pins though, but not the other way around. But all in all, they do their primary task well, especially for the price, and they do come with a rather long and thick screws. I'd think twice before buying them again, but I don't have any complaints in what they are meant to be doing.