Genuine Metabo HPT siding nails are manufactured at higher standards for material and workmanship to help eliminate downtime so you can work more efficiently. Metabo HPT (formerly known as Hitachi power tools) offers an extensive line of professional grade power tools and accessories for woodworking, metalworking, drilling and fastening, concrete drilling and cutting, outdoor power equipment products as well as a complete line of pneumatic nailers, staplers, compressors and collated fasteners.