Bosun product catalogue and information booklet. The Bosun Paving, Kerbs and Retaining Wall Blocks Handbook covers all of industry leading concrete products. One can view our SABS compliant concrete paving products, our precast concrete kerbs and our patented retaining wall blocks and systems. Our handbook also includes residential and commercial paving designs and ideas, installation guidelines, objective tips and advice, as well as technical concepts and guidelines pertaining to our key markets. Bosun – “Expect the Best”, is more than a tagline, it is the reason we exist.