Angle grinders can be controlled by an on off switch - Wonkee Donkee Tools
4" Air Angle Grinder (ON/OFF Switch,11000rpm) - 4" Pneumatic Angle Grinders (ON/OFF Switch), Air Disc Grinder, Air Grinder | Made in Taiwan Air tools & Pneumatic Hand Tools Manufacturer | GISON
250V ON/OFF Position Toggle Switch for Angle Grinder E3I4 | eBay
Milwaukee Agv10 Angle Grinder On/off Switch 4931453588 from Spare Parts World
Buy A Bosch GWS 11-125 CIH ON-OFF SWITCH 1607000A85 Spare Part Type: 3601H30B00