This is a pen holder replacement only. 

The standard Pen Holder can draw on smooth surfaces. 

The Rough Pen Holder can draw on rough surfaces like cylinder block. The Rough Pen Holder Kit comes with a bottom bracket required to draw on rough surface. This does not come with the bottom bracket. This is a replacement for the Rough Surface Pen Holder only. 

Life time warranty for either Pen Holder available here: https://www.botsy.com/products/pen-holders-life-time-warranty