3/8-16 x 3 1/2 Carriage Bolt Fully Threaded Black Oxide and Oil 3/8-16 The hexagonal head provides ample

The hexagonal head provides ample surface area for easy tightening with a wrench or socket

and the 6 refers to the length of the bolt in inches

The zinc finish provides corrosion resistance and helps to prevent rusting

This 7/16"-14 x 1" Hex Cap Screw is made of Grade 8 steel and has a yellow zinc coating for corrosion resistance

This 1/2-13 x 7 Hex Cap Screw is made of durable 18-8 stainless steel

3/8-16 x 3 1/2 Carriage Bolt Fully Threaded Black Oxide and Oil 3/8-16 The hexagonal head provides ampleThis 3 8 16 x 3 1 2 Carriage Bolt is fully threaded and features a black oxide and oil finish. It is made of steel and has a hex head. Carriage bolts are commonly used to attach wood to metal or wood to wood. The square neck below the head prevents the bolt from turning when the nut is tightened. The black oxide finish provides corrosion resistance and the oil finish helps to prevent rust.