A nut and bolt cover apparatus is preferably made from three pieces. A cover piece may be placed over a nut and may have an adapter piece placed over the cover. An exterior cover may be releasably attached to the adapter piece and may squeeze a portion of the adapter piece as the exterior cover is releasably attached to the adapter. Squeezing the adapter piece preferably compresses the cover piece and causes the cover piece to grip the nut of a nut and bolt assembly while the adapter piece grips the cover piece. Removing the exterior cover may relieve the compression forces causing the adapter piece to grip the cover piece and the cover piece to grip a nut, thus permitting the nut and bolt cover apparatus to be removed.