The only thing missing since this is an adjustable hole punch is to have an adjustable 'stop' mechanism so that you know where to place the bottom of the paper to be punched.
It does the job punches holes but it is susposed to be a 10 sheet puncher. I can't do but maybe 5 sheets and I find it difficult to to make sure both ends are in as far as they can go. Maybe it's just me.