... type, Serrated I type; Cross bar: Square twisted cross bar, Round cross bar2. Types of Drainage/Ditch Cover: a. ... anti-theft)2.1 Normal type of Drainage/Ditch Cover Embedded installation, safe and reliable, anti-thrust (not ... shed)2.2 U type of Drainage/Ditch Cover Both ends welded with angle steel, so no ... part. 2.3 Security type of Drainage/Ditch Cover Both ends connected with steel frame through gemel, ...