Spycraft Knives’ wharncliffe gives you an undercover edge.
Spycraft Knives is a new player in the game and offers some cloak-and-dagger in its design. As the company’s name suggests, its SK-4 Sentinel is designed with input from ex-SpecOps personnel and is designed for carry on your person or gear.
It’s a ringed knife with a handle shape that feels good in the hand and feels heavy in the hand. Its wharncliffe-shaped blade is a great all-around style, and the angled false edge slims the tip a little. It’s definitely a stout knife, but above all, it must cut. So, let’s run it through the basics.
Light-Duty Testing

Up first I tested the edge out of the box with paper slices. The SK-4 sliced fairly quickly with its factory edge and produced a clean cut on all but one attempt. I had a tear, but I put that on operator error as I caught the sharpening notch. Overall, the edge seems to have a medium grit finish designed for heavier work.
I moved on to single-walled cardboard with the Sentinel producing nice, clean cuts with plenty of curling. This was thanks to the knife’s hollow grind in its thick blade steel. It’s possible to get a bit of binding in certain materials with the blade, but it’s possible to push through it. Here, the edge was aggressive, and I had to make sure to keep my fingers clear and had a few close calls with shaving skin.

On to 8-ounce leather, the SK-4 was really aggressive. Slicing, I got a crunching sound with every cut and found the thumb notch helped keep the cuts evenly spaced. When I switched to skiving, the knife was still talking to me with every cut. Honestly, I didn’t feel any resistance when I was attacking the leather.
Heavy-Duty Testing

Pinewood was the SK-4’s next task and some whittling. I had to use a steeper angle because of the grind, but the knife produced very uniform curly cues for a fire stick. The contoured handles gave me plenty of control while making the longest cuts and thickest curly cues.
I batoned the SK-4 into seasoned Hackberry wood. The first hit buried the blade, then I banged on the tip till the wood split. I tried holding the knife by the ring to give my hand room once the tip was buried. It worked, but I felt a lot of shock in my hand. Once the larger chunk of Hackberry was split, the SK-4 quickly split the thinner pieces. I found no noticeable damage to the edge, though it had a few wood smears to oil out.

Time for my favorite medium, sisal rope. The SK-4 crunched its way to 146 cuts before the edge started to slide. Nicely done. What was especially nice was that I found no hot spots on my hand from the handle. Overall, the wharncliffe blade aggressively zipped through the rope.
Overall Take
The SK-4 is a lot of knife in a smaller package. It has good edge retention with a comfortable handle. I am not a big fan of ringed knives, and I would like thinner steel used to keep weight down.
SK-4 Sentinel Specs
Maker: Spycraft Knives
Steel: K340 tool
Grind: Hollow
Overall Length: 9”
Blade Length: 4.09”
Weight: 7.26 ounces
Finish: PVD
Blade style: Wharncliffe
Handles: Textured G10
MSRP: $399
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