• It is good practice first to locate the hole with a drill of smaller diameter.
• The location for each hole should be spotted on the pipe with a centre punch.
• It is good practice first to locate the hole with a drill of smaller diameter.
• The location for each hole should be spotted on the pipe with a centre punch.
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012