DBI-SALA Advanced 5 Piece Hoist System w/ 23-1/2” to 42-1/2” Upper Mast* The telescoping reach of 23 1 2" to 42 1 2" of this davit arm ensures mechanical device lifeline(s) remain centered over the confined space. * An adjustable vertical height of 33" to 43" eliminates the need for custom length masts and extensions allowing one system to cover a range of different confined space scenarios. * The built in primary and secondary pulleys route the lifelines of two mechanical devices for smooth, efficient rescue and work