For a pair overhead trolley, need 2 bolts and nuts, 2 H-attachments or 1 I-attachment.
For a load bar assembled, need 2 pairs overhead trolley, 4 bolts and nuts, 2 B-attachments, 2 spherical washer, 2 bushes, 2 castle nuts and 2 cotters.
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- B308 TECHNOLOGY BUILDING, EAST SOFTWARE PARK, NO.90 WENSAN ROAD, 310012 HANGZHOU, CHINA