Perko Thru-Hull Fitting w/Pipe Thread Bronze MADE IN THE USA 1/2". Neck is threaded to approximately 3/8 inch from flange. Cast bronze. Technical Information: Pipe Size Inches: 1/2 Mouting Hole Diameter Inches: 13/16 Maximum Hull Thickness Inches: 1-3/8 O.D. Flange Inches: 1-1/2 Model Number: 0322DP4PLB Ship Weight: 1.8/7.9 lbs. Specifications for Perko 1/2" Thru-Hull Fitting w/Pipe Thread Bronze: Manufacturer: Perko Color: Black Features of Perko 1/2" Thru-Hull Fitting w/Pipe Thread Bronze Machined to fit a boat hull Grooved to retain bedding compound Neck threaded approximately 3/8" from the flange Pipe Size: 1/2"; Mounting Hole Diameter: 13/16" Max Hull Thickness: 1-3/8"; OD Flange: 1-1/2" Package Contents: Perko 1/2" Thru-Hull Fitting w/Pipe Thread Bronze Perko 0322DP4PLB: Thru-Hull Fitting w/Pipe Thread Bronze MADE IN THE USA 1/2"