Detailed Answer
Key counts for shipyard equipment: gantry cranes (hoist/trolley/bridge/auxiliary hook) 10-12 keys; tower cranes 8-10 keys; overhead cranes 8 keys; hoists 6 keys. LDER LD-6SK to LD-12DK covers all (¥268–¥978); XINGJIA ¥350–¥1,800. Block lifting involves complex motions, so 10+ keys are recommended.
| Gantry crane | 10-12 keys |
| Tower crane | 8-10 keys |
| Hoist | 6 keys |
Note:Block lifting demands precision — dual speed is a must.