Specifications:

• fits 10mm main shafts.
• Accepts 4mm flybars.
• Accepts main blades with 4mm bolt holes and 12mm root.
• Accepts 3mm 'Jesus' bolt
• Dimensions: 170mm x 71mm x 65mm
• Weight: 228g

Applicable R/C Helicopters:

• Radikal E640 Flybar Electric RC Helicopter (CN1320EFB) (replacement part)
• Radikal N640 Flybared Nitro Fueled RC Helicopter (CN1320NFB) (replacement part)
• RADIKAL G20 GAS-POWERED RC HELICOPTER (CN1330**) (optional upgrade)
• SWIFT NX ARF ELECTRIC RC HELICOPTER (CN1045) (optional upgrade)
• SWIFT 620SE CARBON KIT (CN1043) (optional upgrade)
• Swift 550 Carbon Electric Helicopter Kit (CN1042) (optional upgrade)
• SWIFT 550 SIZE SCALE MECHANICS (CN1046S) (optional upgrade)
• Century 30 size ARF Scale Mechanics (CN1000S-30) (optional upgrade)
• Century 50 size ARF Scale Mechanics (CN1000S-50) (optional upgrade)
• 2-Blade Electric/Nitro 600 size Scale Mechanic (CN1000S50-2) (optional upgrade)
• All Century 550-600 size (.30-.50) Scale Helicopters (optional upgrade)
• Swift 100% Ready-To-Fly (RTF) Large Electric R/C Helicopter (optional upgrade)
• Swift 16 (optional upgrade)
• All Ravens (optional upgrade)
• All Falcons (optional upgrade)

For assembly instructions and replacement parts, see page 5-7 of the Radikal N640 manual
(http://www.centuryhelimedia.com/Manuals/CN1320N1.00.pdf)