reflex and flat transparent gauge glass for level gauge(gage) used for boiler (liquidometer glass) gauge glass, also named gage glass, sight glass, liquidometer glass, boiler glass, level gauge glass, level gage glass, reflex glass, including the reflex gage glass and the flat transparent gage glass, it is used in level gauge in boiler. now our products have been exported to pakistan, poland, england, croatia, malaysia, usa, syria and so on. and we are keeping the long term cooperation with our clients. about the detailed product information, please come to our website: http://asbestos-joint.com/asbestos-rubber-sheet/absetos-rubber-sheet-html/sight-glass.htm material: borosilicate, category: reflex, transparent, high pressure three flutes , four flutes. ect. the sizes are as follows: 340 x 34 (30) x 17mm 320 x 34 (30) x 17mm 280 x 34 (30) x 17mm 250 x 34 (30) x 17mm 218 x 34 (30) x 17mm 190 x 34 (30) x 17mm 165 x 34 (30) x 17mm 140 x 34 (30) x 17mm 115 x 34 (30) x 17mm packing: white paper box then in wooden (plywooden) case also, we can make the mold and produce the product according to your requirements. such as print the words on the products, the size, and so on.