Sampling Tube, Finish Steel, Duct Mounting, Depth (In.) 5/8 in, Height (In.) 5/8 in, Length (In.) 10 in, Tube Length (Ft.) 53/64 ft, Width (In.) 5/8 in, Duct Width (Ft.) 0.5 to 1, Standards UL, Includes Notched Sampling Tube, For Use With SL and RT Series Smoke Detectors