The Daniel Defense Vertical Grip includes soft touch rubber overmolding for enhanced grip, wet or dry. Inside the grip is a Dual O-Ring, water tight storage compartment capable of storing small parts. This vert grip is extremely lightweight and utilizes a simple yet durable mounting method for 1913 picatinny rail systems. Not Compatible with KeyMod or M-Lok rail systems. 4.5 Inches Tall 2 Inches Wide 1.38 Inches Thick Weight: 0.15 lb