Secures the king pin of semi-trailers, RV's, and other fifth wheel trailers Fits most commercial and recreational fifth wheel / king pin couplers Steel lock bracket is power coated to resist corrosion High visibility red body alerts drivers that lock is attached Solid steel 13/16" diameter pin Fit padlocks (not included) with 7/8" or less shackle diameter Dimension Pin Diameter: 13/16" Pin Length: 5-1/4" Pin Hole Diameter: 7/8" Inner Width: 2-1/8" Inner Length: 3-1/2" Outer Width: 3-7/8" Outer Length: 4-11/16" Height: 1-3/8"