The RockyMounts DropTop Thru-Axle Carrier is a locking fork mount that allows for easy loading and adapts to minor differences in axle diameter or contouring. Features: The only locking thru-axle track mount for truck and van tracks Compatible with 12mm, 15mm, & 20mm thru-axles up to 110mm wide (for 20mm, shims must be removed) Vertical and horizontal mounting positions TPU overmolded shim eliminates the need to switch out shims for 12mm or 15mm axles Anti-Theft: TPU surface provides sufficient friction to stop the axle from being removed when DropTop is firmly clamped and locked Wide mouth opening to easily load your bike and a locking T-Bolt that adjusts for a tighter hold so the thru-axle cannot be removed when locked Carries 1 bike, up to 45 lbs Lock core, keys, and Track Hardware Included Specifications: Compatible Axle Diameters: 12mm, 15mm, 20mm (w/ Shims Removed) Mounting Hole Spacing: 110mm Height: 30mm or 82mm Depending On Mounting Orientation (Bottom to Center of Axle) Weight Capacity: 45 lbs Color: Black