Furnace Observation Glass intended to protect workers from intense heat and radiations at environments which include welding and cutting processes. It is available in colours and can be customised as per user requirements.Details : Neotherm / Aulektro cobalt blue glass Used for furnace or klin viewing Made in Germany Size : 3 ¼" x 4 ½", 32mm diameter, 53 mm diameter, 37 mm diameter, etc Size available as per client requirement Type : 12 DIN 14 DIN Colour : Green (B) Blue (BL) White (W)