This is a UTG M-LOK offset flashlight ring mount. It is low profile, 3.47 inches in length and comes with two inserts to fit 27 mm, 25.4 mm (1 inches) or 20 mm flashlight tube diameters. Includes M-LOK steel locking nuts, screws and Allen wrench for user friendly installation. Features: Black finish Fits M-LOK Removable offset mount provides 1.83 inches forward or rearward offset Rings 1.12 inches vertical or downward offset