Tamiya Genuine Mini 4WD Roller Screw Step Screw Set of 20 All items are unused and in new condition. This is a must-have for those who want to replace their roller screws because they've lost them or the screw threads have been damaged! I believe you can't order these screws separately from the manufacturer, so you'd have to take them from the hardware parts bag of a kit. Please also see my profile. #Tamiya #Mini4WD #Roller #RollerScrews #RollerBolts #StepScrews #StepBolts