Locking Cylinder Cap Size 6-1/2 x 3-1/8 in Color Yellow Material Steel Includes (1) Lockout Device (1) Brass Padlock with 3 Keys Standards OSHA 1910.147 ANSI Standard Z244 Meets DOT Standards Neck Ring Diameter 3 1/8 in Padlock Shackle Max Dia 3/8 in Max