Powernail Co. introduces its new Model 250 Manual T& G Powernailer for 5/16” to 5/8” Engineered T&G Hardwood Flooring. The 6 1/3 pound Model 250 uses the exclusive PowerBlade and E-Powercleats nails designed specifically for Engineered T&G Flooring. E-Powercleats nails are available in various lengths, packaged 1,000 to a carton.