Hangman Q-Hanger - Easy Release Outdoor Wire & Christmas Light Hanger - Stainless Steel: QH-36 Easy installation ; QH-36 is a 36 pack Stainless steel and weather proof ; The loop itself is 7/16, but the opening is 5/32 Leave in year after year ; The overall hook is 1.85 and the thread itself is .75. Wind proof and rust proof The screw end is 3/16 diameter or #10. However, when pre-drilling you would need to use a smaller hole so a 1/8 drillbit is recommended.