Non-slip rubber strap with 0.8 pitch gear on it. Works with the gears of FocusONE and Focus Module for HeadPLUS Designed to wrap around the focus or zoom rings of lensesEasy adjustment and mountingCan be mounted without any toolsMax. lens diameter 4.33 in (11 cm)Weight: 0.67 oz (19 g.) actual weightCompatibility: 25 mm to 110 mm lens ring diameterCan be placed around any mechanical lens with or without hard stopsQuantity:1 x Lens Gear