Error-Proof Compression: The QB2 doesn't leave any room for user error when it comes to Microflashing® compression. Once the Dual Drive Shoulder Screw is secured, the Microflashing® is compressed. Only 3 Components: The QB2 is comprised of Microflashing®, an L-foot and a Dual Drive Shoulder Screw. No more Nuts needed to tighten and secure the L-foot! Not only does this simplify the installation process, it also cuts down the installation time.