Raider T-Top aluminum Single clamp on boat fishing rod holder fit 1.5",1.875",2" horizontal or vertical Pipe -Made of high quality, marine-grade aluminum extrusions and cold-drawn tubing -Clamp size: 2.125”/54mm, rubber liners to fit 1.5 inch/38mm,1.875 inch/48mm, 2 inch/51mm tubing -Rubber inserts inside the tube to protect your rod -Inside diameter is 1 3/4",Length is 10 1/2" -Can be mounted to vertical or horizontal bars -Clamp turns and locks in place every 45 degrees -Easily mounts to T-Top or other hardtop, tower, radar arch, rail, or any structure made from 2",1-7/8",1-1/2" pipe -Holds up to 1 fishing rod What is in the box -Four Rod holder -One Hex key -Four Rubber inserts 1.5",1.875", 2" Weight: 7 lbs/3.2kg Package: One carton box 14"x7.5"x5.5"(35*20*14cm)