Features:

Electronic speed control, DC 21-25V charge function, electric drill tool switch
Great to replace the old or broken   of your drill
Easy for installation and convenient for usage

Specification:
Material:Plastic and Metal
Color:Black
Maximum Current: 16A
Voltage: 21V-25V
Size:5.5 x 4 x 1cm/2.33 x 1.57 x 0.47"(L x W x T)

Package Includes:

1 x Dustproof Speed Control Switch for Electric Drill

Note:
1. Please allow minor errors due to manual measurement. Thanks for your understanding.
2.
Monitors are not calibrated same, item colour displayed in photos may
be showing slightly different from the real object. Please take the real
  as standard.