The screw-on end cap has a flat head socket cap screw that spreads the pin to secure the end cap and does not require a profile end tap. It adds a finishing touch to your project and closes off profile ends to limit dust and debris buildup.
For technical details and images, please search for the product using the 80/20 interactive catalogue found here: https://catalogs.8020.net/80-20-Catalog-26/C/.