Customized version of https://www.thingiverse.com/thing:1042960

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=1042960

Using the following options:

$fn = 50
Ro = 5.5
Ri = 5
Rb = 5.5
H = 30
depth = 1
tapered = 0.66
decrease = 0.3
fillet = 0.34
driverBaseWidth = 1
driverBaseLength = 8
keyChainHeight = 3
keyChainRadius = 1.5