This "wizard" wheel calculator is also available in metric.
Side 1 - perform standard industry calculations.
Side 2 - view drawings of commonly used fittings and connections.
Punched to fit a 3 ring binder.

Custom Produced: In your colors with your contact information.
Size: 8.5" x 11" card with a 7.25" wheel.
Material: Heavyweight calculator board
Quantity: Minimum 500