If you are using a T profile you will need one of these. I ordered both sizes plus mandrels for each. They cleanly cut through about 80 linear feet of MDF. They are high quality and you can't beat the price.
πͺ Precision Slotting Cutter Assembly by Amana Tool: Achieve Clean and Accurate Cuts
3 Review
Cutting disc BOSCH Multi Wheel 2608623013, 125 mm 1
8 Review
πͺ Enhance Precision Woodworking with the Timberline 270 20 Slotting Cutter Assembly
4 Review
Bosch 1608132006 Rabbeting Depth Planers
4 Review