Made of Borosilicate Glass.
Cat No. Socket Approx O.D. of tube (mm) Approx. total length
4012A 7/16 10 115
4012B 10/19 13 115
4012C 12/21 16 120
4012D 14/23 18 120
4012E 19/26 22 120
4012F 24/29 28 135
4012G 34/35 38 140
