Prime Guard Locksmith 9 months ago ID: #728081 Listed In : Home Appliances 1718 Massachusetts Ave, Cambridge, MA 02138 (617) 363-9060 http://primeguardlocksmith.com/ Business Description N/A . Business Hours Monday : 09:00 - 09:00Tuesday : 09:00 - 09:00Wednesday : 09:00 - 09:00Thursday : 09:00 - 09:00Friday : 09:00 - 09:00Saturday : 09:00 - 09:00Sunday : 09:00 - 09:00 Reviews & Ratings Write a Review No Review. Please login / register to add your review.