Review on MKT Conset Masonry Phillips Diameter Fasteners at Screws by Sirious Cavalli

Do not buy! Doesn't work in concrete! This is a poor imitation of Tapcon screws. The material is soft and will not work in concrete. Replaced with Tapcon screws and it works great. I bought these thinking they would be a little cheaper and in larger quantity than the hundreds of Tapcon screws I used to attach the plywood to the concrete floor panel. No problem with Tapcon screws (except for a few broken #3 screwdrivers from time to time), but these screws are pure junk, not good for concrete. Save time and money and buy Tapcon or its equivalent.