These Magnetic Edge Clasps sit on the edge of a bag flap or strap closure. Perfect for gorgeous clutches, handbags, and evening bags. They are very easy to install, and look stunning! Measurements: Width 1-5/8in (40mm) x Height 7/8in (22 mm) To install: Simply attach the magnetic side on the bag front using the provided washer, using the same technique as you would for any magnetic snap. Slide the Half Moon Clip over the finished edge of a flap or strap closure and use a mini screw driver to screw in the 2 provided screws right into the fabric. Making holes first is not necessary or recommended. Make sure the flap or closure is thick and durable (Pellon Peltex or similar recommended). Use some glue on the metal clip for security and some "loctite" or similar lock tightener in the screw holes