Nuts and Bolts

This is a drawing of the bits left over from when "we" fitted my reclaimed spiral staircase.  It's a bit worrying that there are so many but actually because of the way it's been fitted these really are surplus.  I don't anticipate it collapsing any day soon (famous last words!). 

It's drawn using Derwent Coloursoft pencils on white A4 pastel paper.