Hi There,
 
We can not give you advice about how to sharpen objects or what objects to use in order to 
SH.
We can encourage you and be supportive of you stopping your 
SH though.
Next time you want to cut, try keeping a log. Write down:
-Time.
-Place. (Location)
-Situation. (What is going on to make you want to 
SH.)
-What you are feeling and why.
-How you think that cutting will help.
-What would happen if you cut.
-Why you shouldn't cut.
This can help you figure out a few things:
-What you get out of cutting.
-The negatives to cutting.
-In what situations are you triggered. (For example, when people argue, you are left alone, etc.)
Once you know these things, as time goes on and you use 
alternatives to SH, you will be able to figure out the pattern of your 
SH, why you do it and how to react without 
SH to situations.
This may take some time but that is okay.
You can stop 
SH and you are a lot stronger than you may feel.
If you ever need anything we are all here for you and you can 
PM me any time about this or anything else you may be going through.