NcSTAR Vertical Grip for Picatinny and Weaver Type Rails Black. Specifications for NcSTAR Vertical Grip for Picatinny and Weaver Type Rails: Manufacturer: NcSTAR Color: Black Fabric/Material: Plastic Height: 4.5 in Condition: New Mount Type: Weaver Attachment Type: Weaver Picatinny Features of NcSTAR Vertical Grip for Picatinny and Weaver Type Rails Tool-less design for mounting on rails Twist bottom knurled knob until recoil detent is flush below mount Slide vertical grip onto rail Use side witness holes to align with a rail cross slot and tighten knurled knob until detent locks grip to the rail.Grooved vertical grip surface for a secure grip Overall height 4.5inH 3.75inH grip surface Vertical grip is made from black polymer plastic Vertical Grip Not designed for Pump Shotguns Package Contents: NcSTAR Vertical Grip for Picatinny and Weaver Type Rails NcSTAR AARHP: Vertical Grip for Picatinny and Weaver Type Rails Black