Unfortunately my husband told me to buy this so I could reupholster our dining room chairs. I had no choice but to use these secondary staples and a stapler. More than half of all the staples I've used are wrinkled or don't go in, or a mixture of both. It ended up tripling my work hours, putting strain on my arms and wrists, and now my arm is swollen and injured. I stayed up all night with pain in my arm because the stapler and staples were terrible. I've tried adjusting all the different pressures on the handle, as well as my own pressure holding the stapler. If you want to hurt yourself, waste your money or time and end up sending it back for a refund. Be my guest. But if you're sane, skip this one and buy a better one. learned here.