Description The Project Flock Saddle Rail Mount is an alternative mount for your Biomotion rear light. Using this mount you will be able to keep everything off your seat-post. Which is nice when you have an aero-seat post or a carbon seat post. And this alternative mounting location won’t change the effectiveness of the light! Project Flock Saddle Rail Mount Features & Specs Adjustable mounting for different saddle rail distances Mounting by 2x 3mm Hex wrench bolts 3mm Hex wrench included in box – no need to buy tools! Looking for just the normal saddle rail mount? We’ve got that too : Flock Light Multi-Seatpost Mount.