mast adapter:  
1.from L68 to L46, from L46 to L24,It is economic way to mix potain tower crane mast sections.
2. from integral mast to plate mast,It is acceptable for liebherr tower crane mast sections
3. OEM adapter, basing on customer's requirement, and we design for them.

this could mix types of tower crane mast sections together, to help tower crane rental company to save the tower crane cost.