Decotacks 7/16" Pearl Shape Upholstery Nails, Sofa Tacks, 25 PCS/PACK DWP (Black Pearl) Head Size : 7/16" (11mm) *** Shank Length : 5/8" (16mm) *** 25 PCS/Pack They are very beautiful and looks like jewels on your furniture Soft pad is provided in every packs, this pad will help you to install them with steel hammer, just need to stick it on your hammer. Mechanical Connection between Base & Diamond, No Glue Used!!! Requires proper tools like Needle nose pliers and soft face hammers to install them. Hitting directly by steel hammers may damage the diamonds. Not using pliers will cause bending. So please use pliers and don't use your fingers to hold them while hammering.