Customized version of http://www.thingiverse.com/thing:84258

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=84258

Using the following options:

tolerance = 5
hook_width_percentage = 100
peg_length = 40
peg_offset = 25
backing_board = 6
hole_size = 7
peg_item = U
end_arm_percentage = 48
add_shelf_support = N