surepromise Stainless Steel Clamp On Rail Mount Fishing Rod Holder for Rails 19-25mm Tube Quality made 316L stainless steel design for the harsh marine environment. The rod holder has a full length internal plastic sleeve which keeps your rod free of the stainless tubing whist perforated holes in the bottom allow water to escape. The rod holder securely fixes to the rail tubing 19mm-25mm with allen key headed bolts. Adjustable base plate allows 360 degree articulation allowing you to get the perfect angle to secure your rod. Tube Length: 235mm. Tube external Dia: 50.8mm (as pictured). Fit rails : 19-25mm.