Escape Climbing 100 Pack Stainless Steel Four Pronged T-Nut | Durable Steel Hardware for Rock Climbing Holds | Easy Installation HIGH QUALITY | These Stainless Steel T-Nuts are a 304 grade of stainless steel. CONVENIENT | These T-Nuts are designed for super easy installation on a rock climbing wall ADAPTABLE | These T-Nuts are useful for both a rock climbing gym and a home climbing wall STANDARD DIMENSIONS | Traditional 4 Prong T-Nut with a -16 diameter requiring a 7/16 diameter hole