Customized version of http://www.thingiverse.com/thing:193647

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=193647

Using the following options:

non_thread_length = 16.8
resolution = 0.5
socket_facets = 6
head_diameter = 12
drive_type = socket
nut_thread_outer_diameter = 10.5
thickness = 1
wing_ratio = 1
thread_step = 2
outer_diameter = 13
slot_depth = 2
socket_depth = 3.5
drive_diameter = 5
head_height = 4.5
nut_diameter = 13.5
facets = 6
thread_length = 5
nut_height = 4.5
non_thread_diameter = 0
slot_width = 1
nut_thread_step = 2
countersink = 2
nut_type = normal
step_shape_degrees = 45
thread_outer_diameter = 9.5
nut_step_shape_degrees = 45
inner_diameter = 9.9
texture = exclude
type = washer
head_type = hex