This attaches to the back pin of the Heel Bracket assembly. It rotates up under the Heel Lever and prevents the Heel Lever on the back foot from pre-releasing when landing hard in a tele stance. 

This is the NEWEST heel lock. If you have a Heel Lock that clicks onto the spring arm, you'll need to purchase a Heel Lock Upgrade Kit. (All 2022-current bindings will use this heel lock)

One (1) Heel Lock. Each binding uses one Heel Lock. One set of bindings requires two Heel Locks. Compatible with both the BMF/R and the BMF/3.