Replacement latch tab for the ones that frequently come on toolboxes and are held on only with a narrow piece of plastic that eventually wea out and breaks. Just screw it in using the provided holes, or print the solid veion and drill your own holes. I used #6 3/8" stainless steel screws, so that's what the holes are sized for. Make sure you screw it in such that it fits tightly. One of mine isn't tight enough and it will occasionally pop open by itself. If this happe to you and is a problem, you may be able to slightly scale the print to make it fit tighter. Edit: Yes, you can. I took .5 mm off the length of mine to make it fit tighter and now it fits perfectly. I printed in PETG because it's supposed to be more flexible. Enable supports with an angle of 80 degrees. You don't need supports under the main part because it's a bridge, but the tab on the end does need them. Should be 100% infill, but it's so small there probably won't be any infill anyway.