Based on this product's specifications, here are some alternatives and similar models
Pole-mount adapter Miton MT-P150V2 for lighting and equipment, adjustable bracket
Summary description:
Miton MT-P150V2 pole-mount adapter designed to attach lighting fixtures and other equipment to poles. The adapter provides a secure bracket solution for vertical installations, compatible with standard pole diameters. It is intended for outdoor and indoor mounting where a stable, adjustable pole connection is required for lights, sensors or small devices.