89 mm (05134670001) is used for fastening and loosening recessed TORX PLUS screws where a 1/4" hexagon drive is required and compatibility with DIN ISO 1173‑F 6

as stated in the manufacturer's description

The installation guide from the manufacturer outlines the relevant steps for correct connection: selection of the correct connector relative to the copper conductor

T0052921399N)

Acoustic and tactile signalling when the set torque is reached

Reduktionsmuffe 63/50 ESD Unit(s):Pcs 89 mm (05134670001) is usedReducer for ventilation duct Product Overview Reducer 4 6350 6 from ALSIDENT is a reduction connector that connects bench mounted Alsident extraction arms to ventilation ducts. Reducer 4 6350 6 reduces the duct diameter from 63 mm to 50 mm and is designed for direct mounting on spiral ducting. The product is made of conductive antistatic polypropylene (PP) and is black. The reducer is intended for use with System 50 AS and is ordered separately for