Features: Extends from 9" to 13" Direct attachment to a Picatinny Rail only Swivels (tilts) to compensate for uneven terrain. Notched Legs are spring loaded for fast deployment.(What's this?) Ultralight weight - 13.5 oz Has a built-in sling swivel stud to attach the sling. Ideal for prone position or benchrest 100% Made in the USA. Material: Heat treated steel and hard alloys Hard Rubber Leg Caps Polymer knob Finish: Anodized Black Mfg: Harris