Staples
High Pro FS-50 Pneumatic Flooring Stapler
Use 18 GA 1-1/2" long staples when installing thinner 1/2" thick solid wood floors (per manufacturer's recommendation).
Use 15 GA 1-3/4" long staples when installing 3/4" solid wood flooring, when 3/4" plywood is applied directly over a concrete slab—so that the staple does not go through the 3/4" plywood, hitting the concrete.
Use 15 GA 2" long staples when installing 3/4" solid wood flooring over a wood subfloor with floor joists, or when installing 3/4" flooring over two layers of 1/2" plywood over a concrete slab.