The Scotty 238 Rail Mount Adapter is for use with the No. 222 & 223 Sidewinder Rod Holders. Works with a Triggerlock mount to clamp to 7/8" and 1" round rails.
I bought this last week, and i am suprised! This Scotty Scotty 238 Rail Mount Adapter f/ 222/223 Sidewinder Rod Holders is just wonderful! For 11.99, It has surprisingly nice quality.