I could not load roofing nails into this nailer. After several hours of unsuccessfully trying to load and drive roofing nails with numerous sticky and bent nails, I noticed on the box that the maximum nail head diameter is listed as .215-.224 inches. Since the heads of roofing nails are over 0.250mm, there is no way they can fire roofing nails. I believe this machine is falsely advertised. I sent the seller a review through eBay but received no response. DO NOT buy this as a roofing nailer.