Discontinued by G-U Ferco, Old Style Handle Extender for Handle set hardware Prior to 2012.
The old style and new style are not interchangeable.
When adding a handle extension, a longer 5/16 inch square spindle may be needed to connect levers.

Extension Length: 3/4 inch (20mm)
Overall Length: 1-1/16 inch (27mm)
Diameter: 3/4 inch ( 20mm)

Colors: Limited to existing Inventory, When Sold out, custom sizes may be ordered. Price determined by Size and require a quote 
01 = Satin Chrome
03 = Polished Brass
04 = Antique Brass
05 = Oil Rubbed Bronze
6 = Black Powder Coat
25 = Dark Bronze
28 = Pewter / Antique Nickel
This is old inventory, may have minor blemishes

Note: Door thickness varies. A longer spindle may be needed.
To determine the proper length of spindle needed with handle extension, the bast way is to measure what you currently spindle and add 3/4 inch.