THE PRODUCT AND THE SCREW WE WILL SEND FOR INSTALLATION ARE MADE OF 304 QUALITY STAINLESS CHROME. IT IS KNOWN THAT CHROME MATERIALS ARE ONE OF THE MOST HARMFUL MATERIALS TO HEALTH. THE SCREW WILL RUST OFF OVER TIME AND WILL NOT CREATE A BAD APPEARANCE. IT IS VERY EASY TO INSTALL. IT IS SUITABLE FOR ALL POT AND PAN LIDS.