Cable Bend Strain Relieve

I wanted to run wire from this little power supply back and under the table and having just the cord stick out and bend seemed like a bad idea so I designed this little thing that should help. I don't know if there is some name for these things but I couldn't find one and that seems a bit weird to me so if there are some names for these and there are billions of others out there let me know if I am first then great I am either doing something smart or real stupid.Back to the design, there are 3 sizes biggest for something like a power cord and smallest for this fairly thick power cable. It can be secured in place a bit more using zip ties I made gaps for them around 4mm so not the big boys and from what I know about cables they should not be tied up too securely having some slop might actually be beneficial but I am no expert just a guy that doesn't want a cable to run across his desk.