Offering fine quality Level gauge glass=sight glass=reflex glass, with different product category like three tendons (four grooves), two tendons (three grooves),Plan transparent.The size includes 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.The other size is optional or according to the requirements of customers.