24 Tube couplers for BT-20 (18mm) tubes. - 0.625", - 0.705",  2"

12 Tube couplers for BT-50 (24 mm) tubes. - 0.91", - 0.945",  1.75"

12 Tube couplers for BT-55 tubes. - 1.245", - 1.28",  2"

12 Tube couplers for BT-60 tubes. - 1.55", - 1.6",  2"

Tube couplers for BT-70 tubes. 6 Pack - 2.075", - 2.160",  3",  11 g

6 Tube couplers for BT-80 tubes. - 2.474", - 2.554",  3"