Make a Two Bladed Wallet Knife From a Hack Saw Blade





Make a Two Bladed Wallet Knife from a Hack Saw Blade

Step 1: You Will Need:

You will need a cheap hacksaw blade. Why cheap? So that the steel is right. High carbon not bi metal.

Bend and brake off a section of blade about the length of a credit card is long.

Step 2: Grind and Shape the Tip Your Blade. No Grinder: Use Aluminum Oxide Sanding Paper.

Grind and shape the tip your blade. No grinder: use aluminum oxide sanding paper.

Step 3: Keep It Cool by Dipping It in Water.

Keep it cool by dipping it in water.

Step 4: Grind the Teeth Off the Cutting Edge.

Grind the teeth off the cutting edge. The trick here is to only just grind off the teeth and no more as this is were the steel is the hardest and will keep the best edge. Note water dripping off blade: Keep the blade cool! or you will take the temper out and it will not keep an edge when you sharpen it.

Step 5: If You Want You Can Sharpen the Blade on a Sharpening Stone.

If you want you can sharpen the blade on a sharpening stone. But mostly it should be very sharp off the grinder.

Step 6: Now Make a Paper Sheath for Your Wallet Knife. Size Your Paper As in Photo.

Now make a paper sheath for your Wallet Knife. Size your paper as in photo.

Step 7: Fold Paper As Shown

Fold paper as shown

Step 8: Continue to Fold:

Continue to fold:

Step 9: Unfold and Then Fold Up Tip to Close End:

Unfold and then fold up tip to close end:

Step 10: Refold:


Step 11: And Tape Closed:

and tape closed:

Step 12: Hold Knife As Shown to Use:

Hold knife as shown to use:

Participated in the
The Instructables Book Contest



    • Fandom Contest

      Fandom Contest
    • Colors of the Rainbow Contest

      Colors of the Rainbow Contest
    • Classroom Science Contest

      Classroom Science Contest

    33 Discussions


    11 years ago on Introduction

    nice idea the saw blade idea is a good one.... ill probally make one to repace the razor blade in my wallet

    1 reply

    9 years ago on Introduction

    round the end and sharpen the dull side of this then you have a knifesaw

    is the thing for self defense or survival or something? if it is for self defense i have my jet black stiletto witch is bigger! but then again i wont always have my stiletto, i will make one of these knives that folds! ingenious!


    10 years ago on Introduction

    PlastiDip could work for a handle. Then still with the paper to save your wallet,coat, etc.


    Reply 10 years ago on Introduction

    I think it would be the opposite. For self defense a shallow tear cut is effective in warning someone and producing a lot of visible blood without deadly damage to organs, but a ground-down blade would cut deeper and do more permanent harm, but the cleaner cust would not necessarily cause as much pain and startle the aggressor as much in the next few seconds.


    11 years ago on Introduction

    This would not be a self defense item. Guaranteed loss of your own blood. But, a great utility tool idea.

    1 reply

    Reply 10 years ago on Introduction

    Indeed, plus when law enforcement sees a homemade cutting device they call it a weapon more readily than an off the store shelf _small_ pocket knife. When they see that someone took the time to make such a thing, they tend to assume a person planned ahead about using it as a weapon and knew of a danger but put themselves into that danger anyway, just as they would if someone carried a large combat knife instead of a small pocket knife.


    10 years ago on Introduction

    just buy a cheap knife cause you could cut yourself while tring to use this


    11 years ago on Step 12

    so all i need is a hack saw blade and that sand paper stuff

    1 reply

    10 years ago on Step 7

    try a maccano handle cos the bolts might fit through the hole at the end