3M™ DBI-SALA® Confined Space HC (High Capacity) Core Insert Base with Top Plate is constructed of galvanised steel and is designed to be installed flush into the working surface. The plate mounting holes are used for fixing it to the mounting surface. When used as part of our complete system, this base meets the requirements of EN795:2012, EN1496:2006, CEN/TS 16415: 2013, and AS/NZS 5532.