They manufacture welding electrode holders are suitable for manual arc welding with covered electrodes of length not more than 450mm. there are two types of electrode holders: Type A Fully insulated, suitable for adverse welding conditions like ship building or welding in enclosed conditions. Type B Semi insulated, for general open shop conditions. They have three varieties of welding electrode holders that come in both types of electrode holders: *Mark I (600A/30%) Suitable for all sizes of electrodes *Mark II (400A/ 30%) Suitable upto 4.00 mm electrodes *Mark III (200A/ 30%) Suitable upto 3.15 mm electrodes.