Workplace height (C) and overhead (D) , knee (E) , and foot (F and G) clearances are indicated for a typical standing workbench. The knee and foot clearances (E,F, and G ) permit the operator to stand with knees bent and feet pointed straight ahead. Work height (C) varies according to the type of task being performed , the size of the objects worked on (B) , and the location of the hands when doing it (A) . Height A is the optimal working height of the hands , B is the typical height of the objects being assembled , packed , or repaired , and C is the height of the work surface without a product on it. Guidelines for determining the proper standing workplace height for a given task are further explained in the text.