TruMotion 6mm Diameter Worm Gears, Length 10mm - Pack of 50

TruMotion-Miniature-Worm-Gears-TruMotion-37-0305-p-Miniature-worm-gear-for-use-with-TruMotion-motors-p-TruMotion-6mm-Diameter-Worm-Gears-Length-10mm-Pack-of-50

Price: £ 2.59 from Rapid Online Rapid Electronics Ltd.