QSTF-1/4-6-B QSTF-1/4-8-B QSTF-1/8-3/16-U QSTF-1/8-4-B QSTF-1/8-6-B QSTF-1/8-8-B QSTF-3/8-10-B QSTF-3/8-12-B QSTF-3/8-5/16-U QSTF-3/8-8-B