Customized version of http://www.thingiverse.com/thing:245556

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=245556

Using the following options:

peg_length = 35
hook_width_percentage = 100
end_arm_percentage = 50
tolerance = 5
peg_offset = 25
add_shelf_support = Y
peg_item = U
backing_board = 6
hole_size = 7