The famous MAGNAIL tm are ideal for your control stations. Magnetized for fast and easy detection. Available in: 1 1/2" (MAGNAIL-1), 2" (MAGNAIL-2), 2 1/2" (MAGNAIL-3). When working in an urban surrounding be the one that catch the attention. Our custom plastic washers will let every one know you've been there. Available in colors to match you survey markers.