Some background: my neighbor was working on a ladder and reached too far to one side, causing the ladder to fall, resulting in three broken ribs as well as various contusions and other injuries. He was trying to nail in cable clips that had nails on them. I used these screw-in type clips that allowed me to put them into the nut-driver on my cordless drill and then reach to fasten them. Worked perfectly - and safely. I will be using the screw-in type from now on. They fit over the cable exactly right and made for a very nice installation.