Sigma ProConnex Steel Screw-in Wireholder Conduit Fittings in the Conduit Fittings department at Lowes.com
Service Entrance Wire Holder Advice : r/askanelectrician
Halex 1-1/4 in. - 3 in. Service Entrance (SE) Adjustable Wire Holder 60525 - The Home Depot
Service Insulator Wire Holders, Lag or Strap - Porcelain — Primus Cable
Halex 2-1/4 in. Service Entrance (SE) Porcelain Wire Holder 60222 - The Home Depot
Steel City W32 Insulator Wireholder | Crawford Electric Supply
Service Entrance Mast Porcelain Reinforced Wire Holder - NSI Industries
Halex 2-1/2 in. Service Entrance Porcelain Wire Holder with Pipe Hanger 60646 - The Home Depot
Airmont Products AP-10921, Heavy Duty Adjustable Porcelain Wire Holder, Reinforced Steel Saddle, Adjustable Steel Clamp Fits Around Any Pipe or Pole, Ceramic Head for Cables or Wires as an Insulator - Amazon.com
SW3BB Steel City 2-1/4" STL Reinforced SC Wire Holder
Commercial Electric 1-11/16 in. Service Entrance (SE) Light-Duty Porcelain Wireholder FSWFP-168-1 - The Home Depot
Service Insulator Wire Holders, Lag or Strap - Porcelain — Primus Cable