KINETIC RESEARCH GROUP EXTERNAL WEIGHT SET M-LOK ATTACHMENT Add weight to the forend of your chassis for better balance and stability. Each individual weight takes up two M-Lok slots and can be stacked side by side on forends with 4 or more available slots. The size and shape has been optimized to provide a comfortable thumb-self for your non firing hand for alternative shooting positions. Weights are sold in pairs. FITS: W-3 Pro W-3 (Gen 7) C-4 X-Ray Bravo chassis or other chassis/forends with two or more M-Lok slots SPECS Weight: 0.365 lbs per single weight (0.73 per set) Material: Steel Made by KRG Mfg: Kinetic Research Group