Product DescriptionThe HKS GL453 magazine speed loader is an adjustable, thumb-operated loader designed to make filling compatible double-stack pistol magazines faster and easier while reducing sore fingers and fatigue. Built from durable black polymer, it is compatible with select .45 ACP and 10mm Auto magazines, including Glock 20/21 and HK USP models.Product Highlights Adjustable double-stack magazine speed loader for quicker, easier reload preparation Thumb-lever operation helps reduce finger strain and loading fatigue Black polymer construction for lightweight, everyday range-bag durability Compatible with Glock 20/21 and HK USP magazines (as specified by the manufacturer/distributors) Capable of rapidly loading a 15-round magazine (advertised: about 18 seconds)Specs Brand: HKS Manufacturer Part Number: GL453 UPC: 088652004539 Product Type: Magazine speed loader Stack Type: Double stack Adjustable: Yes Color: Black Material: Plastic/Polymer Compatible Calibers: .45 ACP, 10mm Auto Compatibility: Glock 20/21; HK USPDisclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.