STM Dux Rugged Case for Microsoft Surface 3 (stm-222-103J-01) Designed to fit Microsoft Surface 3 Only.Does not fit Surface PRO 3. Tested to meet or exceed U.S. Dept. of Defense Standard 810F/G drop test protocols. Super-protective, polycarbonate and rubberized construction for even the most accident prone among us. Infinity Hinge allows for multiple typing and viewing angles. Also provides for stable horizontal viewing. Simple device installation/ removal - no need for special tools Tough clear polycarbonate back panel for a custom look or asset tagging for schools or businesses