The following is an implementation of a safe handle for a device info set:

type DeviceInfoSetSafeHandle() = 
    inherit SafeHandleMinusOneIsInvalid(true)
    [<DllImport("setupapi.dll")>]
    static extern bool SetupDiDestroyDeviceInfoList(IntPtr deviceInfoSet)
    override s.ReleaseHandle() = SetupDiDestroyDeviceInfoList(base.DangerousGetHandle())

It's extremely trivial to set this up that it's almost not worth blogging about but maybe someone can benefit from the example...