Rugged Mast Installs Quickly by the Customer with No Welding Necessary, Provides a Permanent Blade Mount for LR Series Machine Display Receivers The DM-20 is an easy-to-install rigid mast for LR machine display receivers. No welding is required for any machine and no drilling/tapping is required for Trimble Ready machines. The DM-20 is a permanent, rugged mount and mast system that withstands high vibration hard-pan grading. The 42” tall mast provides the ideal LR receiver height for bulldozer applications. The DM-20 is an optional accessory for the LR machine display receiver family and supports their “off-the-shelf” customer friendly installation. The DM-20 allows customers to easily “Extend the Beam” and increase the productivity benefits of their GC laser purchase.