The Piu 2.0 uses a variable notched design with smooth teeth on the brake side of the device to lock onto ropes with more friction than other tube-style devices. Other features include the ability to set up the device in auto-block mode for belaying two seconds and a large rigging hole that allows a locking carabiner to rotate all the way through. The Core Lock is an extremely smooth HMS belay and rappel carabiner with a secure screw lock closure.