Excellent quality for an affordable price. This multifunction small electric drill has an array of instruments designed in line with safety standards. Features of the drill: Hand piece maximum speed: 14000rpm, stepless speed. Positive and negative direction rotation for choosing and it runs stably. The hand piece can install 7 connectors, they are high torque drilling interface, self-stopping craniotomy drilling interface, fast-drilling interface, cannulated drilling interface, oscillating saw interface, reciprocating saw interface, craniotomy milling interface. Battery voltage L14.4V; free from sterilizing; two batteries; The whole body can be sterilized. High torque drilling interface Fastest speed: 250rpm. Self-stopping craniotomy drilling interface The Max. speed: 1200RPM, has the function of self-stopping after piercing craniotomy to ensure safety in operation. It is also suitable for neurosurgical operation. Fast drilling interface Maximum speed: 1200rpm. Cannulated drilling interface Max. rotating speed: 1200rpm Max. hollow diameter: 4.5mm Suitablefor K-wire and interlocking nails operation. Oscillating Saw Interface Oscillating Frequency: 14000Times/min Oscillating amplitude:50 degrees Safe and fast saw blade removal device. Reciprocating Saw Interface Reciprocating Frequency Of 14000 times/Minute. Reciprocating Amplitude 2.5mm-5mm, Continuously Variable Transmission, Safety Blade Removal Device. 5 saw blade for free Craniotomy milling interface Milling head drilling speed: 30000rpm Continuously Variable Transmission, Stable Running 4 pieces of mills for free