it has long shaft with hole.

Johnson geared DC motor has exclusive high torque, best suitable with highly developing capable robots or robotic platform, various automation purposes.
Gear box is built to handle the stall torque produced by the motor, the motor Shaft comes with a metal bushing for wear Resistance.
 
Specifications:
•     150 RPM 12V DC Motor With Gear Box.
•     18000 RPM base motor
•     Shaft : 6mm
•     Gearbox diameter : 37 mm.
•     Gear : metal spur gear assembly
•     Motor Diameter : 28.5 mm
•     Length : 63 mm without shaft
•     Shaft length : 25mm
•     Weight : 165 gm
•     Torque : 10 kgcm
•     No-load current = 800 mA(Max), Load current = upto 9.5 A(Max)