Manhole cover accessories from Grainger include manhole shields, jacks and rollers. Manhole shields fit 27 in, 30 in and 32 in diameter manholes. Guide air hoses and cables at the pipe invert with manhole cover accessories such as jacks or rollers. Jacks include an eye bolt to secure rope and ease retrieval. Rollers install at the surface so there is no need to enter the manhole.