Zinc coated. Compare these to Chief Part # 092110.
Replacement Frame Anchoring Locking Collar for Chief Frame Machine
Replacement Chief Frame Machine Tall Anchoring Stands - Single
Replacement Chief Style Frame Anchoring Stands - Generation 4, Single unit.
Replacement Chief Style Pinchweld Clamp Jaw - G3 Clamp
Replacement Chief Style Pinch Weld Clamp Assembly - G4
Replacement Chief frame machine Pinchweld Clamp Jaw
