A good auto factors should have a tool for removing them... around 40 euro do... depending on how deep they are positioned in rim, you might be able to nick them with a flat punch and tap them around with punch or chisel and hammer.. again this realy depends on the rims and if you can get at the bolt without hitting your rim.. the tool you buy might not work if the bolts are down in narrow hole in wheel.. i had a prob with jap car i got that had no key and i used the chisel at them and they were buddy club p1 which were hard to get at stud but i took my time and done it with no damage.. it will all depend on your capabilities what you go for