Wing Serov "DS189HV" with “Another style upper case.” You will be able to use 2style mount.

*Standard mount lug top case included

[Torque] 53.3@6.0v / 59.7@7.4v oz-in

             3.5 (6.0V)/4.3 (7.4V) kg･cm [Speed] 0.20 (6.0V)/0.16 (7.4V) Sec/60° [Dimensions] 1.14x0.43x1.18in / 29 x 11 x 30mm [Weight] 0.485lb / 0.78oz / 22g [Wire Length] 50mm [Voltage Range] 6.0V-8.5V  

• Metal Gear

• With Ball Bearing (dual)