The Max Mobile Lead Shield with H-Base is a durable lead shield with 0.5mm PbEq. With all steel H-base for maximum stability, this Phillips Safety features hardened chrome steel post and a Posi-Lock height adjustable arm with spring-loaded pin. With an open base design, it has base overall dimensions of 24? W x 24? D, and base inside dimensions of 20 W x 16 D.