SPECS 
WAVEGUIDE SIZE: WR284
Frequency: 2.60 - 3.95 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": 0.040"
12" to 24": 0.045"    
24" to 48": 0.050"
48"+: 0.060"