The is made for quick and easy installation of motors mounted with transom clamps. This adapter kit is compatible with CMC PT-130 Tilt & Trim (item #28321 and #31542) and ATLAS THT-130C Tilt & Trim. Use with the PT-130 / THT-130C for installation of smaller motors mounted with transom clamps. Also works with ATLAS Micro Jacker. If your motor has clamps that tighten inside of the splash well, you will need to purchase this transom clamp adapter if you want it to fit on Tilt & Trim units or Jack Plates designed for standard, full-size motor mounting. Some motors are too big for the smaller Tilt & Trims or jack plates, but they need an adapter to fit on larger plates. These are the adapter plates. Compatible with CMC PT-130 Tilt & Trim Adapts some motors for larger jack plates | CMC Tilt and Trim Transom Clamp-On Motor Adapter