Blind Flange Lockout Device, Color Red/Black/Silver, Nut Dia. 0.750 in to 1.125 in, Fits Pipe Size 1/2 in to 3 in, Flange Size 1-1/2 in to 5-5/8 in, Max. Number of Padlocks 4, Padlock Shackle Max. Dia. 5/16 in, Material Aluminum/Steel, For Use With Pipelines, Standards OSHA 1910.147