This is the One-Way Clutch Shaft for the Thunder Tiger Titan 50 SE Helicopter. FEATURES: Steel construction Silver in color INCLUDES: One one way clutch shaft One main shaft bolt One M3 locknut Two snap rings REQUIRES: Installation onto one-way assembly SPECS: Length: 34.5mm (1.36") Outer Diameter: 14mm (0.55") Inner Diameter: 10mm (0.40") COMMENTS: This part is shown on page 7 in manual lmm 10.21.10 ir/jxs