Power Tools
RS550 DC electronic starter 12 Teeth 10.8V 14.4V 12V 16.8V 21V 25V 21500-29000RPM for Electric Drill/Screwdriver with Two-Speed 1Pcs electrical tools
electronic starter Drives
https://www.bizrate.co.uk/powertools/rs550-dc-electronic-starter-12-oid31169256293.html