Eased Edge Brackets. 1-1/4" thick with a round over edge.

#15 = 3-1/2" deep x 6-1/2" high x 1-1/4" thick

#20 = 5" deep x 8" high x 1-1/4" thick

#30 = 6-1/2" deep x 9" high x 1-1/4" thick

#35 = 8-1/2" deep x 11" high x 1-1/4" thick