Hillman 461380 Underlayment Nail, 1-1/4 in L, Steel, Bright, Flat Head, Ring Shank, 1 lb

Fas-n-Tite bright underlayment nails are ideal for attaching composition underlayment or plywood over existing floor. These nails feature a ringed shank, providing excellent pull-out strength. These nails are not recommended for use in treated lumber or where corrosion is a concern.