Its flat head is designed to eliminate the need for a washer and provide a semi-flush finish to applications. These unique bibs are ultra absorbent with a comfortable stretchy ribbed neck opening preventing food and liquids from trickling down the neck . Snaps on easily for great meal time coverage The heads is designed to eliminate the need for a washer Carriage Bolts are designed to fasten a wooden face to either wood or metal Aazon.co: Hillan Stainless Steel, 1/4 x 2-Inch, 832518 Carriage Bolt... 1/4 Stainless Steel Bolts 1/4-20X3 1/2 Stainless Steel (50 Count Carriage Bolt The square underside of the head is self locking to eliminate spinning and the need for a driving tool. Carriage Bolt Stainless Steel 1/4-20 X 5/8 Qty 25 Bolts Stainless Steel provided superior rust prevention and bright finish They are used in wood connections utilizing the square neck under the round head which will sit into the hole to prevent the head from turning. These carriage bolts come plated in zinc for moderate corrosion resistance. From the Manufacturer Carriage Bolts have a smooth, rounded head that has a small square section underneath.
