Robinson High Speed Drill
Recommended for use on medium to hard scale when the ID of a tube is heavily chocked with deposits. 3 fluted steel drill with 1/4 -28 male thread. Sizes listed below are actual drill diameters.
| Part Number | Body Diameter |
| JRRHSD38 | 3/8" |
| JRRHSD716 | 7/16" |
| JRRHSD12 | 1/2" |
| JRRHSD58 | 5/8" |