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Use a brass motor that does not easily generate heat and provides a longer service life The thickened aluminium alloy base can reduce noise, vibration and movement and is more stable The motor speed is between 4,000 and 9,000 rpm, which is very convenient and saves both labor and time The chuck model is B12 (1.5 x 10 mm), the drilling stroke is 40 mm and the drilling capacity is high › See more product details; Product description Use a brass motor that does not easily generate heat and provides a longer service life The thickened aluminium alloy base can reduce noise, vibration and movement and is more stable The motor speed is between 4,000 and 9,000 rpm, which is very convenient and saves both labor and time; Product description Use a brass motor that does not easily generate heat and provides a longer service life The thickened aluminium alloy base can reduce noise, vibration and movement and is more stable The motor speed is between 4,000 and 9,000 rpm, which is very convenient and saves both labor and time; Use a brass motor that does not easily generate heat and provides a longer service life The thickened aluminium alloy base can reduce noise, vibration and movement and is more stable The motor speed is between 4,000 and 9,000 rpm, which is very convenient and saves both labor and time