K390 or M4? BATTLE TO THE DEATH!!!
Spyderco Edge Stability Death Match | M4 versus K390
M4 vs K390 - Toothy Edge Steel Battle for the Ages!
S110V unleashed (Vs M4 and K390)
K390, 15v, 10v, m4.. Why am I addicted to these kinds of steels? This video has no answers!
Spyderco Police 4 K390 | "The M4 Killer"
The Power of K390: Steel Test Fine and Coarse Edge
Spyderco Shaman M4 64.6 hrc vs Police 4 K390 65.4 hrc. Who wins this showdown of steel?
K390 - The Best High Edge Retention Knife Steel?
MAXAMET VS K390
Cruwear vs K390
Revealing My Top 6 EDC Knife Steels-Which Will Be the BEST?!
How do these stack?
Spyderco k390. one whole year of use. How did it do? Good? Great? Or is it trash? I think you know..
My Top 5 Favorite Knife Steels & Why
Spyderco k390 And m4 edge retention results!!!
"MAXAMET IS FRAGILE"
Edge Retention - 3Cr13/420, VG-10, k390, CPM-M4 (cardboard)
LIONSTEEL M390 VS M4 | Knife Overview
Week 1 Test Update: Spyderco CPM REX45 VS BOHLER K390