This is the standard headstock drive belt for the Myford ML7 lathe and the Tri-Leva.
This belt drives the headstock pulley from the countershaft.
The standard ML7 takes one of this belts but the Tri-Leva uses three, so when an order is placed from three belts you will be sent a matched set.

We also sell a quick fit link version of this belt which can be found in the related products link below.