7/16" x 3/4" x 1/4" x 1/16" Black Rubber Grommets 20PK They may be used to reinforce the hole, to shield something from the sharp edges of the hole, or both..
.1/4"-20 x 5" Hot Dip Galvanized Grade 2 / A307 Steel Coarse Thread Carriage Bolts 100PK The square section grips into the part being fixed (typically wood), preventing the bolt from turning when the nut is tightened.
1/4"-20 x 5" Hot Dip Galvanized Grade 2 / A307 Steel Coarse Thread Carriage Bolts 100PK The square section grips into the part being fixed (typically wood), preventing the bolt from turning when the nut is tightened.