Bracket that lets you mount a standard 40mm fan to a slot intended for 45mm fans as found in some high current ESC's such as the 8S 550A ESC Brushless-E6Max. Although that ESC states it comes with a 50mm fan, it is in fact a 45mm.

Replace a failing fan that will lead to your expensive ESC cooking or get way better cooling and way more fan options by upgrading to a superior 40mm fan than whatever fan it is that the ESC came with. 
 
Please look at technical drawing for exact dimensions.

Comes only with the bracket and 4 M3 nuts. You will need the original bolts that held the original fan to mount the bracket onto the heatsink. You will need 4 M3 bolts of sufficient length for your 40mm fan.

PRINTED IN HIGH-TEMPERATURE RESISTANT ASA (LIKE ABS).
IF YOU NEED FAN MOUNT BRACKETS / ADAPTERS PLEASE LOOK AT MY LISTINGS OR CONTACT ME.