This ambidextrous vertical grip is a simple lightweight and cost-effective device which secures tightly to any M-Lok mounting system. The low profile vertical grip design provides a positive hand hold in a small package. Adequately sized to allow the hand to take control of the front of the rifle but not large enough to get in the way. The battery compartment will fit two CR123 batteries. - Requires 1/8 Hex Allen Wrench to install. - Specifications - 6061-T6 Aluminum - 3.125 Tall - Weight 2.75 oz. (without batteries) - Hardcoat Anodized matte black to Military Specifications or better - Compartment fits 2 CR123 Batteries - Made in the USA.