What spindle should I use for lever handle set?
Our lever handle sets use our square combo spindle SSD-LH04.
Check out the table here:
They are available to order from here: https://www.idealinc.com/en/square-combo-spindle
Note: For 3/4" thick door, you could order a SSD-LH04-64, then cut off about 6mm (1/4") from the tip (small spindle side) with a metal hack saw.