What is the minimum specification for hollow drill bits?
Hollow drill and drill core from the hole, the center, drill, drill steel, magnetic drill, rail drill etc..
The minimum specifications of the hollow bit are: 12mm in diameter, depth of drilling 25mm and depth of 35mm
Hollow drill bits are available:1. diameter minimum 12mm, maximum can do 160mm;2. drilling depth are 25mm, 35mm, 50mm, 75mm, 100mm and so on;3. cut to 35mm: in diameter, 12mm to 50mm in diameter. Cut depth is 50mm: diameter from 12mm to 100mm. Cut depth is 75mm: diameter from 16mm to 100mm. Cut depth is 100mm: diameter from 18mm to 100mm.
