HSI assembled socket head pump to hull bolt kit. All stainless for corrosion resistance. Sold as a set of FOUR.
Offered for OEM Yamaha applications (SJ, WB1, Rickter, etc) that utilize a fine thread, and also offered for a Revolver application that utilizes a course thread.
Yamaha engine bolt kits are listed separately here
Part Number(s):
Yamaha: 91-0001
Revolver: 91-0003