A screw, or bolt, is a type of fastener characterized by a helical ridge, known as an external thread or just thread, wrapped around a cylinder. Some screw threads are designed to mate with a...
Ground screws are screws that have been ground into a fine paste in an industrial tumbling machine. They are extremely useful as a grout for tile. the term would apply to the green screw you find in...
Usually with the tire iron/wheel wrench included with the jack. If that is missing, try a ratchet with a socket that fits. I've even used a screwdriver to twist it half-turn by half-turn.