Customized version of http://www.thingiverse.com/thing:66900

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=66900

Using the following options:

hook_width = 35
height = 20
clamp_width = 50
length = 115
thickness = 5
width = 80
catch = 5
clamp_offset = 0
add_catch = true
hook_offset = 0
rounding_radius = 5