I would be a little more worried about kids sticking things into the wider keyway, but yes, they are very hard to drill. I had to open a bunch of Abus locks that use the same type of key, and it took much longer to get into each padlock than it takes with the same method to open a damaged Medeco. They can be picked, but it takes a highly specialized tool and someone with skills akin to a professional safe cracker.I put these in instead of the tubular type after I ordered the "tool" to open a bunch of locks at a closed wash I bought the salvage rights on. May not be any better but harder to pick, and the stainless disk the key goes through should make it harder to drill or grind out the guts.