Description More pattern than the Blank of Chamfered Stair spindles. A little more robust than 32mm version. 35mm being the middle of the 3 standard stair spindle sizes. How do i know how many Stair Spindles i need? When deciding on the amount of stair spindles that you require, there are 2 good methods to use as a general guide, 8 stair spindles per metre or 2 stair spindles per tread. This will give you a very good idea of quantity, although may not be perfect.