Service entrance wire holder

Halex 1-1/4 In. to 3 In. Adjustable Porcelain Service Entrance

Topaz Service Entrance Mast Kit 1517

999 - Southwire 999 - Adjustable Porcelain Wire Holder w/ Steel

Capital Electric Supply

Sigma ProConnex™ Porcelain Screw-In Insulator and Wire Holder at

22 x 4 REINFORCED WIRE HOLDER

in Pipe Clamps.

Airmont Products AP-10921, Heavy Duty Adjustable Porcelain Wire Holder, Reinforced Steel Saddle, Adjustable Steel Clamp Fits Around Any Pipe or Pole

Halex 60222 2-1/4-Inch Service Entrance Heavy Duty Porcelain

Can someone please tell me what this rounded cable holder is