FIX-LCB-20 is a low-carbon steel, low-profile lag screw bolt. It is used in the construction and manufacturing industries, specifically in concrete, steel, wood, and aluminum applications to secure two objects together. The lag screw is secured by screwing the lag screw into the material, creating a secure connection that is more secure than conventional screws. The lag screw also has a large bearing diameter, which results in a secure connection and a low-profile head, which provides greater strength and flexibility than other types of screws.