Abstract: A tool holder for use in a wall panel having a panel thickness includes a circularly cylindrical anchor bar having a length greater than the width of a slot of the panel and not greater than the minimum length of the slot; a circularly cylindrical connector bar having the anchor bar extending beyond opposite sides of the connector bar; a base rigidly connected to the other end of the connector bar and extending on opposite sides thereof and spaced from the anchor bar by a spacing S not less than the panel thickness, the base extending in at least two intersecting directions on opposite sides of the connector at the spacing S from the anchor bar for contacting the panel at locations spaced about the connector bar and stabilizing the holder against tipping in any direction relative to the wall panel when the connector bar protrudes the slot with the anchor bar extending on opposite sides of the slot.