8" Long, 400 MHz, Amber, Concentricity ± 0.007mm, Camber ± 0.019mm Thrift 5mm Tubes, N-51A Borosilicate Glass, Caps Attached Kontes brand thrift tubes are manufactured from KIMAX® N-51A borosilicate glass and their performance is assured by state of the art manufacturing and inspection processes for camber and concentricity. Caps attached.
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