Rear transfer case flange adapter. Must be used with the following drive shaft part numbers: RE1887-240 (2-door) and RE1887-430 (4-door).Fits 2007 to 2014 JK Wrangler, Rubicon and Unlimited,2 and 4-door models,Billet aluminum flange,8mm-1.25 x 25mm socket cap screws,