The SENCO SHF15's ratchet system gives do-it-yourself, rental, novice and professional floor installers a multiple-hit tool with ample power to set nails. Nails not fully driven by the first blow remain positively positioned for additional strikes. It has a rugged composite base that virtually eliminates scratching and damage to the surface of both unfinished and prefinished wood. And at only 7.6 lb, the SHF15 is ergonomically designed with the hardwood installer in mind.