"After reading the only review on these I was a bit put off on getting them but as they were only to use to zip tie outside Xmas lights onto I thought if need be I can drill a slightly bigger hole and use some silicone to help hold it in place, this I did not need to do I tried a 9mm hole first and hit one in with a hammer and it was perfect nice and tight and no problems, I've done around 10 so far and not had any break like suggested in the previous review, so for the price and how useful they are I really can't fault them. The person before me must of been unlucky and had a bad batch is all I can think of."
"I have used a different brand of these fixings before to good effect, the ones I had used before were made of nylon and could be hammered into place without harm. The first time i used these these the 'ribs' all broke off when i hammered the fixing into the pre-drilled hole. When i finally got one to stay in place (after four others broke) the head snapped off the moment i pulled a zip tie through it. They seem to be made of a hard and fragile plastic that has no place in a 'hammer in' fixing.