The workhorse mounting for location work is the lightweight tripod. It has pointed feet to sit firmly on rough surfaces, can be attached to a 'skid' (wheeled base) or 'spreader' (flat base) for smooth surfaces, e.g. a polished floor. The legs can be individually extended and the panning head levelled with the aid of a built-in spirit level. A good head will have an adjustment for correctly counterbalancing any camera over its whole tilt range and a friction adjustment for panning and tilting to facilitate smooth operation. A small tripod ('baby-legs') is also available for low-angle shots.