If your railing has multiple post sizes, our Solarband VersaCaps are a handy solution. Not only do they provide wireless LED lighting with a modern design, they adapt to fit most rail posts made of wood, vinyl or composite; and work with most leading post sleeves on the market. Set includes 3 bracket inserts nested inside the base. Depending on the number of inserts used, the post cap fits most posts ranging from 3-1/2" x 3-1/2" to 4-5/8" x 4-5/8". Rechargeable batteries also included.