QS1 KQS1 BK N C QS1 KQS1 BK S C QS-1/2-10 QS-1/2-10-50 QS-1/2-10-I QS-1/2-12 QS-1/2-12-20 QS-1/2-12-I QS-1/2-16 QS-1/2-16-20