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Hi Robert and welcome. Should be a 1-inch tube at the mount point however, I would confirm with Streamlight Customer Service at Phone: 1-800-523-7488 // 1-610-631-0600 or by online inquiry here: -- https://apps.streamlight.com/contactus/ContactForm.aspx?_ga=2.268772273.1506206247.1739959618-306445169.1739959618