Stainless Steel Driveshaft: The 175g extra heavy stainless steel driveshaft features knurling for best grip at your fingertips and secure handling of film with silicone rings 100% Non-Slip Transport: Silicone rings can be set to 35mm and 120 and rest on the film edge for minimal contact Multi-Format Compatibility: Cutting marks for a wide range of formats, including 35mm, 6x4.5, 6x6, and 6x7 Light Table Compatible: The Film Killer is designed to let light pass through from below to take out the guesswork Blade locks in safety position