Check the listing for details. Opsal Aluminum Tree Spikes. Condition: Seller refurbished. Listed at 240.00 USD. Opsal Aluminum Tree Spikes are specialized climbing spikes designed for power and utility tasks. Made from durable aluminum, these tree spikes provide a secure grip on tree trunks, allowing for safe and efficient climbing by industrial workers. The spikes are designed to withstand the demands of demanding industrial environments, making them a reliable tool for various business and industrial applications.