HI Krizz and welcome aboard
Here the order i've made for the Gauntlet Legends T-Molding at
www.t-modling.com :
Products ordered:
-----------------
SKU: T-YEL-75
Product: 3/4'' Yellow T-Molding
Quantity: 20
Item price: $ 0.50
SKU: 3WNG-ASBMLY-116
Product: 3 Wing Slot Cutter Assembly - 1/16" Slot
Quantity: 1
Item price: $ 27.95
The "3 Wing Slot Cutter Assembly " is used with the router...
... in order to dig the wood like this :
Et voila, now you can put the T-molding inside