One Finger Safety Cutter will cut paper and packaging with just one finger, protecting you from opening up tricky packages, envelopes, boxes, etc. It's safe to use. Just place on your fingertip with the head pointing down, hold item to be cut in your other hand or rest it on a cutting mat. Apply pressure and draw a line to make a cut at a 45-degree angle. Also great for coupon cutting and craft projects. One size fits all and comfortable to use. Rubber safety cutter measures 1 1/2 x 3/4 in.