The Chrosziel DV Studio Rig Follow Focus with Drive Gear is made of high-quality materials and is designed for professional filmmakers using DSLR, mirrorless, or movie cameras. The DV StudioRig's main body is made of aluminum, and the big handwheel rotates smoothly with minimal play in the gearbox. To secure the DV StudioRig to 15mm LWS rods, use the knurled thumbscrew on the sliding rod clamp. The DV StudioRig is compatible with a wide range of lens diameters, from small DSLR lenses to big cinema lenses, thanks to the rod clamp slides. A white marking disk with a dry-erase marker or grease pencil is included for highlighting focus pulls.