3/8"-16 x 3/4" Zinc Grade 5 Carriage Bolts (12 pcs.)

Diameter: 3/8"
Length: 3/4"
Material: Steel
Finish: Zinc
Head Style: Carriage
Thread Size: 16 (Coarse)
Thread Length: Full
Hardness: Grade 5
Type: Carriage Bolt
Square-Depth: 7/32"

Box of 12.

A carriage bolt has a domed or countersunk head, and the shank is topped by a short square section under the head. The square section grips into the part being fixed (typically wood), preventing the bolt from turning when the nut is tightened.