A-specification for pipe clamps 1/2 inch (complete set) consist of the following:1- 1/2 inch clamp (face) without welded nut.2- 1/2 inch clamp (back) with welded M8 nut.3- 2 screw M6 x 16mm (for assembling the face with the back.)4- c/w double threaded screw M8 + fisher for M85- c/w nut M8.6- c/w washer M8.note: the outer diameter for the pipes 1/2" 28mm-30mm B-specification for pipe clamps 3/4 inch (complete set) consist of the following:1- 3/4 inch clamp (face) without welded nut.2- 3/4inch clamp (back) with welded M10 nut.3- 2 screw M6 x 16mm (for assembling the face with the back.)4- c/w double threaded screw M10* 120mm + fisher for M125- c/w nut M10.6- c/w washer M10.note: the outer diameter for the pipes 3/4" 32.5mm-34.2mm C- specification for the attached picture (double threaded screw+ fisher) (complete set) consist of the following:1-qty. of 2 double threaded screw size: M10 * 140mm.2- qty. of two nuts M10 for the Double threaded screw. 3- c/w two plastic washers.