Bosch PWS 720-115, 11000 RPM, 4.53" (11.5 cm), AC, 4.19 lbs (1.9 kg) Bosch PWS 720-115. Grinding disc diameter: 4.53" (11.5 cm), Idle speed (max): 11000 RPM. Power source: AC, Input power: 720 W, Output power: 360 W. Weight: 4.19 lbs (1.9 kg)