Mlok 5 piece polymer picatinny weaver rail mount flat base set made of black ABS Plastic. Ideal for attaching lights, laser, optics, bipods, forward grips etc yes you get all 5 rails including 10 mlok screws and nuts. 1x13 slot 145mm long 1x 11 slot 125mm long 1x 9 slot 100mm long 1x 7 slot 95mm long 1x 5 slot 65mm long 21mm wide 9.5mm high profile