QT-156PKG6 Quantity: 6 $21.40	QT-193PKG6 Quantity: 6 $21.40	QA-1428PKG5 Quantity: 5 $6.20

The small head sizes (1-1/2" and smaller) use the QT-156PKG6 tips. The large head sizes (1-3/4" and larger) use the QT-193PKG6 tips. All the heads use the QT-1428PKG5 screws.