Duo-Fast Staplers and NailersDuo-Fast are the manufacturers of many quality fastening tools including hardwood floor nailers, staple hammers, and wood flooring staplers. For over 70 years, Duo-Fast has been synonymous with engineered solutions for wood to wood fastening. The Floormaster Hardwood Flooring Nailer uses narrow gauge flooring nails to create a less noticeable fastening solution for engineered and hardwood floors.