in fig2 a plurality of brush segments 84 are mounted to support sleeve 81 at provided mating grooves 85 see fig2 and 29 fig3 provides a sectional view of a wellbore cleaning tool having integral centralizers which are non rotating the well cleaning tool 96 of fig3 is shown mounted to drill pipe section 12 the well cleaning tool 96 provides a split housing or split support sleeve 97 having integral centralizers 98 cleaning members 99 such as a brush scraper and or magnet are mounted to the split housing or support sleeve 97 external rings 100 are provided the split housing or split support sleeve 97 is placed on drill pipe 12 in between locking clamps 28 fig3 shows an additional embodiment of the apparatus of the present invention which provides free rotating centralizers or centralizer rings 103 well cleaning tool 101 has a split housing 102 to which is affixed cleaning members 104 bolted connections 30 can be used to secure the halves of the split housing together as with the preferred and other embodiments the centralizer rings 103 engage the outer surface of the split housing 102 and are held in position with a locking ring 105 or 106 the locking ring 105 is a threaded type that engages threads provided on the split housing 102 the locking ring 106 is a lock wire type cleaning members 99 such as a brush scraper and or magnet are mounted to the split housing or support sleeve 97 fig3 shows a well cleaning tool designated.