Height Range: 13.5 inches to 27 inches (fully extended). Base Type: Solid/Fixed Base (Model 1A2). It offers maximum rigid stability without swivelling or panning. Leg Design: Three-section smooth legs with friction locks. You simply loosen the knurled knob to telescopically adjust the length, then tighten it to lock it firmly in place. Mounting Style: Clamps directly onto standard Quick Detach (Q.D.) sling swivel studs found on most conventional rifle stocks. It also includes a built-in provision so you can still attach your rifle sling.Materials: Manufactured from heat-treated steel and durable hard aluminum alloys with a matte black anodized finish.