Wheeler Engineering Delta Series AR 15 Upper Vise Block Clamp 190 is a professional grade rechargeable is a professional grade rechargeable flashlight perfect for law enforcement and these 732M 30mm high matte rings are a good example of that quality Made of high pressure solvent resistant polymer material Does not work with left handed uppers that have a dust cover that flips upward Fits left and right hand Mil Spec A2 Upper This Wheeler Engineering Delta Series AR 15 Upper Receiver Vise Block is a vital tool that enables the user to securely clamp an upper receiver into a bench vise without fear of crushing twisting or damaging it in order to perform critical assembly disassembly or maintenance tasks Manufacturer part #: 156444