Mine came with 68.
A total of 72 staples are included per box.
Yes, you use a hammer. I don't know of any staplers that would work for this kind of staple.
Hi Newbie. Thank you for your question. With proper anchoring of the panel, this galvanized 1-1/2 in. 9 gauge staple should do the job nicely. Please let us know if we can be of further assistance. Rick_HD_OC