Stainless steel fishing rod holder is an easy way to add dedicated fishing pole locations on a boat without drilling. The clamp on style rod holder attaches to a 0. 3125" to 1" diameter bar with a 360 degree pivoting mounting plate using (2) hex cap screws and a 3/16" Allen wrench. A tooth edge keeps both mounting plates positioned as tightened down to prevent slipping during trolling, rigging, or fishing.