Sectional overhead garage door hardware. 3/4" W. x 1/4" T. steel slide bolt with heavy-duty zinc steel housing. Works only from the inside for extra protection. Night or vacation security lock. Engages slot in vertical track, fits most all garage doors. Contents: 1 lock assembly, 4 each 1/4"-20 x 1-7/8" pancake head carriage bolts with nuts.