Hand Blade is a technique where the user puts half of there Ki on there hand and it comes out to form a weapon like sword made of pure energy that can slice thought anything. It can be compared to the destructo disk, except that it forms on your hand and comes out. The blade doesn't disappear after it is used, it takes about 2 minutes then it disappears, or it depends on how much energy you put into it.
The Hand Blade is thin but long and can be red, blue, green, and yellow. Red means you have put the most Ki into the technique and Yellow meaning you have put the least Ki.