https://www.acehardware.com/departments/hardware/nuts-and-bolts/carriage-bolts/55506
HILLMAN 3/8 in. X 3 in. L Hot Dipped Galvanized Steel Carriage Bolt 50 pk Mfr# 812581 - Ace Hardware
Carriage bolts are designed to fasten a wooden face to either a wood or metal frame. Its flat head is designed to eliminate the need for a washer and provide a...