Life Line and Pulpit Stanchions are normally fastened through the deck with four stainless steel bolts. For the bolts along the gunwhale, I have replaced them with stainless steel eyebolts of the same diameter of the bolt. Placing the eyebolts near the gunwhale reduces any tripping hazard.
The purpose is to create additional attachment points from snaps to lines from accesories.
I have found this minor change in hardware to have been invaluable at times when an attachment point is needed.