Ratio：
A、HI Speed：：1/15
B、Low Speed：1/64.25
OD：
A、Gearhousing：42.5mm
B、Clutch：50mm
LD：52mm
Change speed mode：Lever Steel wier
Characteristic：
A、Can be used for brush and brushless electric drill
B、Can be select spindle locking function
C、Can withstand a large torque of 35 N / m
