Newest Addition in the Lightsock line! A universal tube clamp - 

Fits any tube with circumference of 1 7/8” or less. Astera tubes, Nanlux tubes, quasar tubes, kino tubes etc.. practically indestructible, will not slip or slide. 

Width 4” (10.6 cm)

Length 7 1/2”b  (19 cm)

Weight 6.6 oz (187 grams)