Weidmueller SDI SET S2.0-5.5

SDI SET S2.0-5.5 likely refers to a set of screwdrivers. "SDI" is probably the brand or product line. "SET" indicates it's a collection of tools. "S2.0-5.5" likely refers to slotted screwdriver sizes ranging from 2.0 to 5.5 (likely millimeters). Therefore, this is likely a set containing slotted screwdrivers in sizes from 2.0mm to 5.5mm.