Rack Cards are small advertising tools and you have to be really impressive here to grab the attention. If you are looking for some expert guidance here, this rack card template here would do the job for you. It offers you good space for uploading an appealing image as visual content always grabs more attention than plain text.
You can even include your IT company’s mission statement on the image banner. The space below would work to list down your services and you can even add a brief here highlighting your vision or positive aspects of your company. The contact details of the company would lie on the bottom of the card.