Holds any size light for precise, vertical positioning including mini lights. C7, C9, and rope/tube lights. It's great for icicle and swag lights too. The all-purpose light holder works on all roofs, even shakes, slate and tile, on all gutters, K or U styles, aluminum, coppy or vinyl. It also works safely on vinyl siding and can be used to string lights on deck railings and fences too. Box of 100.