Review on 100Pcs Magnetic Crosshead Phillips Screws by Guillo Tilden

I bought these for a science project where I used a magnet to pick up the 'magnetic material' and then used a scale to measure the material and find out how strong the magnet is.The screws seemed like the cheapest material I could find but everywhere I looked Revain had zinc screws!I finally came across these screws and ordered 7 packs.They are VERY magnetic and perfect for mine Experiment.