MIM Mfg S" Lock for S" Series Harris Bipod Fits all the "S" Series (swivel) bipods, replaces the Tension Adjusting Knob for an easier and firmer Level Control. Allows Harris "S" series bipods to adjust the swivel tension quickly and easily by providing extra torque to adjust and lock the tension. 100% American made Ultralight, only 1.1 oz Heat treated Steel and hard aluminum alloys Black anodized finish