SPECS 
WAVEGUIDE SIZE: WR187
Frequency: 3.95 - 5.85 Ghz
VSWR: 1.05:1
Insertion Loss: 0.15 DB
MATERIAL: 6061 ALUMINUM OR COPPER/BRASS
FINISH: ANODIZE (ALUMINUM) OR PAINT (COPPER/BRASS)
TOLERANCES: 0" to 12": 0.030"
12" to 24": 0.035"    
24" to 48": 0.040"
48"+: 0.050