birdge level 1) Material: casting aluminium 2) Size:16"/40CM,20"/50CM,24"/60CM 3) With three vials, one horizontal, one vert birdge level1) Material: casting aluminium 2) Size:16"/40CM,20"/50CM,24"/60CM3) With three vials, one horizontal, one vertical4) Milled bottom surface5) Packing: 1pcs/shrink packing6) Available color: Red, Yellow, Green, Blue etc.7) Delivery Lead time: 30-45 days