The GS-C104P has a large solid aluminum wing nut.

Specifications:
Max. Weight Capacity: 440 lbs (200 kg)
Minimum Diameter: 1.9” (48 mm)
Maximum Diameter: 2.0” (51 mm)
TUV Approved
Compatible: GS34, GS12 & GS20 Truss

SKU: GS-C104P
UPC: 713339246543