Yes that’s the Extrema rail-master coping sled. I love it to bits, makes coping a breeze. One cool feature it has is an air cushion in the base when you flick the air clamp on. This helps it glide smoothly on the surface. It’s better suited for a cast iron surface, I used some uhmw tape on the bottom of mine to prevent the aluminum slider portion from getting scratched up. If you’d like I can show a better video of it tomorrow??