What is SSPC sp5

SSPC-SP 5 White Metal Blast Cleaning (NACE No. 1) is a standard used for white metal blast cleaning put forth by the Society for Protective Coatings (SSPC)

What is a step shaft

Refers to tubular steel shafts which taper in a series of steps rather than one continuous narrowing. The stepped shaft was introduced by the True-Temper