High Specification marine grade stainless steel
Match the stemball to the mast/spreader bracket
Increase the stemball bearing surface
Sta-Lok Stemball Cups are manufactured from high specification 316 stainless steel.
Stemball cups are designed to increase the bearing surfacee and ensure a good fit into a mast fitting or mast spreader bracket.
One or two Stemball cups may be required to bring the head size up to fit the mast/spreader brackets.