Steel slip on adapter with 1-1/8" pin for 2" x 4" wood.
Speed-Rail® Starter for 1-1/2" - 3-1/2" to Junior Male
Speed-Rail® Starter for 1-1/2"
Speed-Rail® Starter for 1-1/4"
Speed-Rail® Starter for 1-1/4" - 3-1/2" with Junior Male
Plate Slider Bracket for 1-1/2"