This is the Differential Case Front/Center/Rear For the Tekno R/C 1/8 EB48 4WD Electric Buggy, and SCT410, TKRC5500 FEATURES: Made of black plastic and steel INCLUDES: One differential case SPECS: Diameter: 28mm (1-1/8") Length: 25mm (1") Mounting hole, center to center of diff: 11.5mm (7/16") diameter: 3.0mm (1/8") Center shaft, outer diameter: 8.0mm (5/16") inner diameter: 5.9mm (7/32") length: 5.0mm (3/16") 11/14/12 phijwa