WINDPROOF:The outdoor string light hook,the over latch they tightly in place,like the little safety latch will insure never take it down from the outdoor hooks.WIDELY USED:The outdoor hooks Installed on deck pergola for solar lights,christmas light hooks,hang deck lighting,hang sign outdoors,q hanger hooks for string lights Perfect for hang things under the cabinetsVERY STURDY:The cup hooks for string lights for hanging even hit by multiple storm and its still intact to its place. Sturdy and its coated perfectly to not have a rusty appearance.Even on you bird feeder with birds (sometimes squirrels) hopping onto it its prevailedEASY INSTALL WITH NUT DRIVER:You can cup hooks for string lights screw in the wood with a wrench, or use an drill to drill a hole in the concrete wall, plug the expansion tube into, finally use a nut drill bit socket tool to screw the hook in. 6mm drill bit is recommended. nut driver is a perfect tool that works with any power drillTOTALLY RISK-FREE PURCHASE:21 pack string light hooks outdoor,21 expansion tube,and 1 nut driver.If you are not satisfied with string light hooks outdoor.