I have both sizes. I won't cut without one or at least a cut resistant glove. Why do so many use a rotary cutter with no safety tool to prevent a cutting accident? One guild member scoffed at me for always using the Slidelock at workshops. She said she never got cut because she was careful and paid attention to what she was doing. An hour later an ambulance was called as she sliced her finger to the bone while cutting strips. She got a staph infection and almost lost her finger. That's a big price to pay for being so stubborn.