If your screw posts are broken off it can be tricky to screw your breadbin case back together. These sleeves are designed to slip over the top of the stump of the broken post and be glued in place, repairing your beloved old brown computer. 

Be warned that not all the screw posts in C64 breadbins are the same. There are thicker ones that would need a different sleeve. I might add these at a later date if I have need to make one, but so far I have not seen one of these thicker posts broken.