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uStepper Robot Arm Rev. 4 In this kit you will get: Printed plastic parts* Nuts & bolts Bearings Belts & gears Gripper servo + cable *Printed in 0.2mm layer with 30% infill in PLA. Expect printed quality, not injection mold quality. Tools needed: Hex keys 2, 2.5, 4 mm and adjustable wrench Mechanical kit ONLY - uStepper boards NOT included !