SPECS 
WAVEGUIDE SIZE: WR28
Frequency: 26.5 - 40.0 Ghz
VSWR: 1.1:1
Insertion Loss: 0.28 DB
MATERIAL: Copper/Brass, 6061 ALUMINUM
FINISH: ANODIZE (ALUMINUM) OR PAINT (COPPER/BRASS)
TOLERANCES:
0" to 12": 0.010"
12" to 24": 0.015"    
24" to 48": 0.020" 
48"+: 0.030"