Martinez Tools | 2-in-1 Level Vial Replacement HeelMartinez Tools' 2 in 1 Level Vial Heel Assembly is designed for rapid, precise accuracy. The replacement heels are available in a variety of colours. If you own a Martinez Rapid Square, and dont want to invest in a whole other tool to reap the benefits of the 2 in 1 level vial feature of our latest version, you need only to purchase this heel. Precision instruments rapid squares & micro squares The customizable aluminium heel will work with any