Milk Crate Hook

I couldn't find any hooks that were specific to milk crates. I recently bought a rear bike rack and wanted more storage for groceries and random objects. I've printed them in PLA but with 100% infill to give them more strength. I drilled holes in the model and used a bolt and a lock washer with nut on each. If you know how to model it with the hole you need for the bolts you have , do it prior to the print because there are no holes. These two hooks held up 50 lbs (22.5 kg) of static weight.