Using the Petzl Sm'D carabiner is easy. First, if you choose a locked model, open the gate carefully. For the TRIACT-LOCK system, use the triple - action to unlock it. For the SCREW-LOCK, just unscrew the lock. Then, attach your device to the carabiner through the D - shaped opening. If you're using the hole to connect TIBLOC or MICRO TRAXION devices, make sure they're securely fastened. When climbing, the carabiner without a locking system is great for quick clipping. As for maintenance, keep it clean from dirt and debris. Regularly check for any signs of wear, especially on the gate and the cross - section. Don't expose it to extreme heat or chemicals. And remember, it has a 3 - year guarantee, but use it properly to ensure its long - term performance.