good day,my friend. We are the professional factory of reflex and transparent gauge glass & sight glass .our products have been exported to many countries,such as: USA,ENGLAND,MALAYSIA,PAKISTAN,JAPAN,KOREA,SPAIN,IRAN,MEXICO and so on. the products are as follows: 1. Reflex gauge glass (3 lines 4 grooves or 4lines 5grooves) & Transparent flat gauge glass 500 x 34(30)x 17mm 400 x 34(30)x 17mm 370 x 34(30)x 17mm 340 x 34(30)x 17mm 320 x 34(30) x 17mm 300 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 8"-20" X 1"x 5/8"TSL G/Glass 2. sight glass: round, Rectangular & square , tubular sight glass 3. material: tempered soda lime glass, tempered borosilicate glass, tempered borosilicate 3.3, quartz. 4. packing: paper box, carton , plywood case. or according to requirement. 5. protective gasket: asbestos rubber gaskets ,non-asbestos rubber gaskets, graphite gasket,PTFE gasket,micashield . I BELIEVE THAT YOU MUST BE SATISFIED WITH OUR GAUGE GLASS AND GASKETS. best regards, Kathy skype: kathywang_1979 email: info2@tongfengindustry.com whatsapp: 8613623382856