The OLFA RTY-4 straight-handle rotary cutter is an 18 mm tool for detailed quilting and craft cuts in fabric, paper, and film where control matters. Its compact blade size suits curves, appliqué, templates, and trimming small pattern pieces, and the straight design can be used by right- or left-handed makers. Pair it with a self-healing mat to protect your surface and help the blade edge stay smooth through frequent use.