Escape Climbing 100 Pack Screw-In T-Nuts | Durable Steel Hardware for Rock Climbing Holds | Easy Installation with Screws Included HIGH QUALITY | These premium T-Nuts come with a zinc plated finish for reduced corrosion COMPLETE | T-Nuts includes three screws for easy, painless installation on rock climbing walls CONVENIENT | Screw-in T-Nuts require less maintenance than traditional 4 prong T-Nuts need STANDARD DIMENSIONS | Traditional Screw-In T-Nut with a -16 diameter requiring a 7/16 diameter hole