How to Use: First, make sure you have a 1 - 11/32" (34.1 mm) diameter hole punched by the 710 Metal Stud Punch or a pre - punched hole of the right size. Then, simply insert the bushing into the hole. Thanks to the triple - lock design, it will hold securely. Note: Only use these bushings on metal studs from 24 gauge to 12 gauge (0.6 mm to 2.5 mm). Maintenance: There's not much maintenance needed. Just keep them clean and free from dirt or debris. If you notice any damage, replace the bushing right away to ensure proper protection for your wires.