The aluminum cold glue tabs come in three sizes-Small, Medium, and Large. The small is .490 inches in diameter. The medium is .741 inches in diameter. The large is .990 inches in diameter. Most techs are hot gluing or taping them into a dedicated cold glue slide hammer. Another option that is more popular is ss cold glue puck. It comes in 5 sizes. It locks into the slide hammer so no need to tie a slide hammer with the hot glue or tape method.