2 1/4 inch t lock.

Thanks for writing in. This looks like our 15-194 1" T-Lock Shoe. Unfortunately, your old shoe has a grooved stem that lets it fit into the balance; we do not design our shoes this way. Therefore, you'll need to replace the balance this shoe attaches to as well. See our Series 795 Channel Balances. You will need to swap out the default shoe that comes with the S795 (the 15-195) with the 15-194. See the videos below for more details. While the first video is chiefly about replacing outdated crossbow balances with the Series 795, it's still useful for explaining what you'll need to measure out.