Easy to operate! Accurate! Inexpensive! BODY Turn Holder A to the right. Insert the drill and turn right. Lock Holder B to the right. Select the right collect according to the drill size. Inseret the collet with holder A and B. If drill diameter is φ 4.1 mm or more, turn the lever to the left. Insert the holder slowly and turn to the right, left, right, left until it stops. Insert the holder in thinning base and turn to the right, left, right, left in each sid