Description PTS Low Profile QD Sling Swivel The PTS Enhanced QD Sling Swivel provides a large D loop for a hooktype attachment and can withstand strong pulling forces in all directions. Made of a strong steel alloy, the swivel has been tested to to withstand up to 300kg of load. The QD sling swivel also features a recessed button, a design feature first seen on the PTS ESP-M2, which prevents accidental activation.