Weidmueller SDI SET S2.5-5.5/PZ1/2

SDI SET S2.5-5.5/PZ1/2 likely refers to a set of screwdrivers.  "SDI" is probably the brand or product line. "SET" indicates it's a collection of tools. "S2.5-5.5" likely refers to slotted screwdriver sizes ranging from 2.5 to 5.5 (likely millimeters). "PZ1/2" likely indicates Pozidriv screwdriver sizes 1 and 2.  Therefore, this is likely a set containing slotted screwdrivers (sizes 2.5 to 5.5) and Pozidriv screwdrivers (sizes 1 and 2). To confirm the exact contents and specifications of this set, it's recommended to search online, check the manufacturer's website, or consult relevant catalogs or suppliers.