Except 1mm (32mm long ) mm) and 1.5 mm (length 40 mm), the mount works perfectly. For these two drills, 1mm lagged behind the drill holder and 1.5mm barely protruded <1mm at the top. Otherwise everything is fine up to the largest drill 10mm. I suspect larger drill bits will work; The allowable drill length of 15mm is ≤ 16.5cm, and the allowable drill length of 10.5mm is ≤ 14cm. PLEASE NOTE my quick fix for 1mm and 1.5mm shown in the picture.