Perko 2-1/2" Round Bronze Strainer Made In The USA Perko 2-12 Round Bronze Strainer. Cast bronze. Drilled holes. Technical Information For Thru-Hull Size Inches 38 and 12. O.D. Inches 2-12. I.D. Inches 1-58. Weight 0.2lbs. Box Dimensions 1H x 2W x 2L. Made in the USA.