as seen in fig8 another feature of the shelf support is a rectangular notch 12 which serves as a receptacle for a clip or other fastening means for attaching a shelf to the support 2 as seen in fig2 the lower edge of the shelf support is upwardly inclined from the base end 7 to minimize material usage while retaining strength also the lower portion of the base end 7 slopes downwardly from the lowermost projection 11 to allow for clearance necessary in positioning the shelf support 2 on the vertical channel 1 connection of the shelf support 2 to the vertical channel 1 in a horizontal position is illustrated in fig3 and 4 this connection is accomplished by tilting the shelf support slightly upward so that the t shaped projections 9 and 10 can pass through the upper portion of the t shaped notch 5 at the desired height on the vertical channel when the projections 9 and 10 are fully within the notch 5 the shelf support is moved down so that the rectangular notches 9a at the base of the t shaped projection 9 engage the lower portion of the notch 5 until projection 9 makes contact with the bottom of the notch the shelf support is then brought to a horizontal position as seen in fig4 with the lower projections 11 passing into and resting on the base of corresponding notches in the.