SPECS 
WAVEGUIDE SIZE: WR42
Frequency: 18.0 - 26.5 Ghz
VSWR: 1.1:1
Insertion Loss: 0.20 DB
MATERIAL: 6061 ALUMINUM OR COPPER/BRASS
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"