Phoenix Contact 0824511 You can order a marker specifically designed for terminal blocks with the following features: it can be ordered in sheets, with white labels that are customized to your specifications, and is mounted using a snap-in system into a tall marker groove. The terminal block width accommodates an 8.2mm width, allowing for 64 individual labels per sheet, with text fields measuring 9.7mm in height and 7.55mm in width.