An old plastic milk jug works great for disposing of sharp objects like needles, pins and rotary blades. Use one that has a screw on lid and cut a small slot in the upper side. When ready to throw away just put some packing tape around the jug where the slot is. Items inside are visible so everyone knows to be careful and the plastic is heavy enough to prevent the items from puncturing. Nurses have been telling diabetics to use these jugs to dispose of their sharp supplies for years.