"These Ball Valve Lockouts from RS operate by clamping over the ball valve lever to prevent the valve from operating. These lockouts can be installed whether the valve is in the open or closed positions.Type = Ball Valve LockoutMaterial = Polyurethane PlasticAttachment Point Minimum Size = 9.52mmAttachment Point Maximum Size = 3.17cmLock Shackle Maximum Diameter = 190.5mm"