PIPE BRUSHES .the applications include ships.sugar factories.refineries,refineries,heaters,shocks absorber factories,and general threaded holes,they are used manually .removal of rust residues and adherences inside tubes and holes DIMENSION D ARBOR HOLE ITEM NO PACK QTY PC 13mm 1/4"(6mm) 99908-A 1000 16mm 1/4"(6mm) 99908-B 500 19mm 1/4"(6mm) 99908-C 500 25mm 1/4"(6mm) 99908-D 480 32mm 1/2"(6mm) 99908-E 350 40mm 1/2"(6mm) 99908-F 250 50mm 1/2"(6mm) 99908-G 0.200 63mm 1/2"(6mm) 99908-H 75mm 1/2"(6mm) 99908-I 100mm 1/2"(6mm) 99908-J