String lights can precisely positioned on gutter curve to maximise the beauty of the decorative lights; Plastic Gutter Hooks. Makes the job of hanging outside lights on the guttering nice and easy, a quick and simple way to hang string and icicle lights outdoors. Pack Sizes: 25/60/120/240/480 Gutter hanging hooks, 35 MM long. | UV & frost resistant for all year use. Use S Clip Hooks to hold decorative lights safely in place on your gutter or outdoor, no worries about them falling out after the cold season.The recommended quantity is one gutter hook placed every 6 inches on light strings.