Raw material control:
1.The steel material selected 100 % comes from our natlonal large-scale steel corporations .
2.The materials that steel,welding material etc are all examed by chemical detection ,
3.Strictly conforms to drawing requirements,
4,Every  pins ,axles,sleeves etc are strictly obey quenching and tempering procedures .
5,Every parts of our products strictly conforms to the procedure requirements
6, perform the requirements of the ISO9001 Quality System and national standard strictly.

	Durability   The pin is all processed by the overrall    sand blasting process. The surface is smoother and    more beautiful. It is treated with anti-corrosion blasting.   It uses the highest quality paint in the tower crane industry,   with strong adhesion and longer durability.
More Secure                           All chord connections are all gas-shielded and                            welded. All the products are tested by weld                            inspection, x-ray and UT ultrasonic inspection.                            It is more secure.
	Professional Service SYM has more than 20 years tower crane experience. SYM will supply you best professional advice. 24 hours customer service give you quickly feedback.