QST-3/8-8 QST-3/8-8-50 QST3-1/4-5/16-1/4-U QST3-1/4-8-6 QST3-1/8-6-4 QST3-10-8 QST3-3/8-10-8 QST3384Q QST3-6-4 QST3-8-6