Yaheetech Black Front and Rear Flip Up 45 Degree Offset Rapid Transition Backup Sight Black Material: Aluminum Around 45-degree offset from center, offering no interfer with primary optics Rapid flip-up transition with a quick push button Alters quickly from primary optics to iron sights Size: 2.2 x1.4 x1inch(Front) 2.2 x1.6 x1inch(Rear) G.W:0.26 LB