Standard Pack = 1 piece(s). Diameter = 1-1/4 IN ; Length = 1/2 IN ; Maximum Holding Capacity (lbs) = 40 ; Shape = Round ; Style = B ; Thickness = 1/2 IN ; Thread Depth = 0.15 IN ; Thread Size = 5/16-18 IN ; Type = Rare Earth Pot Magnet ; Useable Holding Value (lbs) = 50 ;