.............................................................RC-3.............RC-4.............RC-6
Overall length:.........................................8 5/16"..........9.0"..............11.75"
Cutting Edge length:.................................3 3/8"...........4.06"..............5.75"
Blade Length (end of handle to tip of knife): 3 7/8"...........4.5"................6.5"
Blade Width:.............................................N/A............1.25"..............1.56"
Maximum thickness:..................................1/8"...........,.188"..............,.188"
Weight: in ounces (knife only).....................5.2
ounces (knife and sheath)..........................9.3
Unfortunately, blade width isn't given for the RC-3, but looking at the others, it's probably 1"-1.125"