Message File Signature Data Certificate Result Certificate Issuer Certificate Serial Number Certificate Expiry Date Officer Email Company Registration Number Company Name SignMessage & Verify SignFile

profit margin was 4.64% of Revenue from sale and service, increased from last year that gross profit margin was 4.28%. This is result from the world steel price in declining trend from last year. Also the

% of Revenue from sale and service, increased from last year that gross profit margin was 3.56%. This is result from effective inventory management even though the steel price trend decreased same as

Attn : The Directors and The MAI Manager Ref: Dimet AC 0818/1 August 27, 2018 Attention: The Directors and The MAI Manager The Stock Exchange of Thailand Subject: Year End result and clarification of

margin was 0.94 % of Revenue from sale and service, decreased from last year that gross profit margin was 4.33%. This is result from the world steel price in declining trend from same period of last year

margin was 7.53%. As a result of increasing in steel price trend from the lowest point at the end of 2019 and the improvement in operation cost. 3. Selling expenses were Baht 39.47 million; decreased Baht

from the same period last year by 45.66 million baht or 54.69%. The increase from the revenue from services by the Company, as a result of continue increasing demand of Non-Destructive testing service

sales volumes. The sharp decline in the Finished Goods prices has also led to a decline in Raw material prices and the Company suffered devaluation loss on Finished Goods stock, Raw Material in stock and

512.5 million in 2016, as a result of following factors: 1. Sales and services revenues increased Baht 2,519.0 million or 16.8% from 2016, due to the higher amount and the higher quality of the Company’s

No.012/2018 May 09, 2018 Subject: Report the operating result for the 1st Quarter ended March 31, 2018 and the explanation for the causes of change more than 20% in the Company’s performance To: The