Made from black powder coated aluminium, it will let you mount any of the Cannon downrigger range, (except Mini-Trol), into an existing rod holder. The pad is pre-drilled to accept all bases. They have a solid 13mm thick top mount pad which measures 127mm by 127mm and an extra heavy duty 6mm wall thickness support tube. Stainless steel mount fastening included. Tube diameter is 38mm and the two shaft lengths are either 9 inch or 12 inch.