Retractable Utility Knife
Retractable blades provide a relatively safe way of handling a razor blade. The housings come is various ergonomic forms and sizes. The blades can be retracted or withdrawn into the housing using a latch or sliding button. Most housing provide additional storage for spare blades. When cutting flat surfaces like cardboard, paper, thin plastics etc. a rigid straight edge (metal ruler) should be used to guide the blade. A cutting mat should also be considered.