The edge you get from a diamond whetstone is sharp enough for pretty much anything and Fallkniven`s new D3 will do the job when it comes to putting a razor sharp edge on your Fallkniven knife. The surface is from industrial diamonds and covered by titanium-alumina-nitrid (TAN). An ingenious alternative to the above is the D3t and D4t, instead of the leather pouch it has a double coated pressure sensitive adhesive tape which allows you to fasten it on any flat spot, e g Fallkniven`s zytel sheaths. The VHB 5925F tape is extremely strong and will harden permanently within 24 hrs. The D3t will fit the F1, H1 and S1 zytel sheaths, while the D4t fits the A1 zytel sheath.