Two 40-60 mm fan adapters. Height: 26 mm Screw holes are 4 mm to make it easier to get the screws to fit even though fan screws are 3 mm. One straight and one with a 45 mm twist at one end in case this is something you might need. I designed this as backup for: http://www.thingiverse.com/thing:190298 in case the 40 mm fan doesn't provide enough airflow. -These have not yet been printed by me so: "work in progress". -Filed under 'Hobby' since these can be used for any application. Comment if you want to and please let me know if you print one.