1/4-20 Nylock Nut
1/4-20 x 3.5 T-Bolt
Sport Tube/Sweeper Clamp, T-Bolt
These are NOT cheap automotive-style band clamps They are a 100% stainless steel band, clamp, and screw. These clamps are designed to give years of trouble-free service. Don't trust anything but the best for your boat.
Elbow Top Clamp, T-Bolt
Big Tube/Big E-Top Clamp, T-Bolt