This shelf is 21.5" long (despite the label saying 21 5/8"), 3 5/8" deep, and 1 7/8" tall on the back (1 1/8" tall in the front.)

The holes are drilled 2 5/8" from the edge to the middle of the hole. 

This is similar to the Ribba shelf but has the Beveled edges instead of the 90 degree edges.