Check the listing for details. Door Knob Spindle, 80mm Long Door Handle Spindle Replacement with Hex Screws. Condition: New. Listed at 13.65 USD. Description:Material & Durability: The door spindle bar is made of galvanized solid iron, and the hex socket set screws are made of stainless steel. These materials are resistant to rust, corrosion, and wear, and are not easily deformed or broken, allowing them to withstand long-term daily use.Functional Design: The slotted end on this spindle is made to engage securely with the set screw inside many common door handles. Its square profile is engineered to turn smoothly without slipping, ensuring reliable operation of the door mechanism. Slotted square steel replaces segmented square steel; the rounding of the shaft does not hurt your hands.Simple Installation: 1. Use a wrench to loosen the handle's fixing screw and remove the old spindle. 2. Insert this slotted square spindle into place. 3.