With standard taper outer joint at the top, and inner joints on the bottom and sidearm, all being the same size. Inner joints are at a 75º angle to one another.

Available Ground joint:

14/20 Ground joint

19/22 Ground joint

24/40 Ground joint

29/42 Ground joint

Be Made From G3.3 Borosilicate Glass

Annealing Point ------560℃

Linear Coefficient of Expansion------ 32×10-7/℃

Softening Point------820℃