Fallkniven FS4

Sharpening your knife has never been so enjoyable! Not only are Flipstones fun to handle, but these diamond and ceramic flints will create a sharp edge on any knife. The diamond stone is coated with titanium alumina nitride, while the ceramic is made of synthetic sapphires. Both materials are extremely hard and measure 10 and 8 on the Mohs hardness scale respectively. They will also maintain a smooth, flat surface making the sharpening process easier, even with the hardest special powder steels. Both stones are sandwiched together using 3M tape and cannot be separated. They are used dry, although a little soap and water can be used to clean the surface. If they feel slightly rough at first, they will gradually smooth out and really improve with age.

Instructions: Hold the flipstone in your left hand. Push the handle on the upper part of the handle forward and press the exposed round button. A steel spring will automatically fold out of the stone and lock it in place. To retract, press the round button and retract the stone by hand. Fold back the handle to prevent accidental unfolding.

Model Length Folded:

FS3 98.7mm / 3.88”

FS4 112.8mm / 4.44”

Diamond grit: 25 micron

Sharp ceramic: 9 micron

Handle: Zytel with stainless bolts