The Big Jon Ball Cradle is made of durable solid aluminum and designed to last and stand up to harsh water conditions. Add this cradle to upgrade your downrigger or easily attach to multi-Set rod holders. High-strength solid aluminumBlack powder coat finishCorrosion resistantUse with Multi-Set rod holders Model: RH00435 (sold separately) Attach with 1 1/8 inch hold down knobs (sold separately)The Big Jon Ball Cradle is made in the U.S.A.