This is a pair of replacement Front Knuckle Arms and Carriers (hubs) for the Tower Hobbies Tower Terror FEATURES: Nylon construction, black in color Factory assembled and ready to install Replaces worn or damaged knuckles and hubs INCLUDES: One Left Side Knuckle and Hub - key number 9 One Right Side Knuckle and Hub - key number 9 REQUIRES: Installation COMMENTS: For the 6x12mm bearings that ride in the knuckles order two of DTXC1569. The instructions and parts breakdown incorrectly identify these bearings as 6x10mm. kpm01/23/2007 ir/jxs updated 5/19/9MAF