SAFCO PRODUCTS-FOOTREST,ADJ,ROCKING,BK. Rock N Stop Adjustable Foot Rest, 17 1/2 W x 11 1/2 D x 3 1/2 H, Black. Unique footrest features an incremented rocking action to promote circulation and muscle stimulation by encouraging leg movement. Easy-to-adjust, just apply foot pressure to change position. Smaller footprint takes less floor space under desk. With anti-skid feet. Width: 17 1/2 in; Height: 3 1/2 in; Depth: 11 1/2 in; Diameter: N/A.