CARBIDE DRILLS are used for cleaning tubes choked solidly with hard deposits.

Tube I.D. Carbide Drill
mm inch
6.4 1/4 PM-CB-250
9.5 3/8 PM-CB-375
11.1 7/16 PM-CB-430
12.7 1/2 PM-CB-500
14.3 9/16 PM-CB-560
15.9 5/8 PM-CB-625
17.5 11/16 PM-CB-680
19.1 3/4 PM-CB-750
22.2 7/8 PM-CB-875
25.4 1 PM-CB-1000