Specification:
Material: CNC Aluminum
Thread: 4-40#(American Standard)
23 teeth, suitable for all JR series
24 teeth, suitable for all HITEC series
25 teeth, suitable for all FUTABA series
Distance from hole center to hole center：1inch, 1.25 inch.1.5inch. 2inch.

Multi size for chosing:
1 inch JR 23T 4-40# red
1 inch Hitec 24T 4-40# red
1 inch Futaba 25T 4-40# red
1.25 inch JR 23T 4-40# red
1.25 inch Hitec 24T 4-40# red
1.25 inch Futaba 25T 4-40# red
1.5 inch JR 23T 4-40# red
1.5 inch Hitec 24T 4-40# red
1.5 inch Futaba 25T 4-40# red
2 inch JR 23T 4-40# red
2 inch Hitec 24T 4-40# red
2 inch Futaba 25T 4-40# red

Package Included:
1x Servo arms (1.5 inch, 25T )