Reely Brass Gear and Steel Worm Drive Set 1:20 (5mm and 4mm bores)

Reely Brass Gear and Steel Wormdrive Sets - Reely 236942, A brass gear and steel worm drive set with a 1:20 reduction ratio. Reely Brass Gear and Steel Worm Drive Set 1:20 (5mm and 4mm bores)

Price: 13.58 from Rapid Online Rapid Electronics Ltd.