The Kershaw 6055 Emerson CQC-4KXL Frame Lock Knife Stonewash Plain Edge. The CQC-4KXL is a larger version of Kershaw's CQC-4. It's designed by Ernie Emerson, built by Kershaw. This knife is manual opening with a thumb disk and Emerson's quick opening wave technology. It has a sturdy frame lock mechanism and grippy black G-10 handle. Reversible pocket clip.