349 Versatile column clamp is designed to work in conjunction with removable tripod columns of between 25 to 28mm diameter such as the 055 and 190 Series tripods. The Column Clamp can be securely fixed to solid surfaces or bars up to 55 mm width. The column with head is inserted into the clamp and locked in position at the required height. The ideal accessory for nature photography or support for binoculars and scopes.