Description High quality domestic 4340 Chromoly MADE IN THE USA at Holmes Hobbies! Stock length 6 screw holes for twice the shear strength! Compatible with 5mm driveshafts, industry standard 2.5mm through hole for driveshaft pin, industry standard "In Phase" outdrives minimize drivetrain harmonics 33 grams per pair One year warranty Special First Edition Machined FInish Compatible with stock and aftermarket Axial AX10 and SCX10 transmissions Compatible with stock and aftermarket Axial AX10 and SCX10 driveshafts Compatible with stock and aftermarket Axial AX10 and SCX10 bottom gears. Note: Robinson Racing bottom gear has three holes and cannot be used with 6 screws without modification.