Slips over the reciprocating tool head and attaches to the chisel with roll pins to increase boring speed in sandy soils.
| Part Number | Grundomat Model |
|---|---|
| GE0452990 | 45 P |
| GRU0652990 | 65 P |
| GRU0752990 | 75 P |
| GZ0852990 | 85 P |
| GRU0952990 | 95 P-100 P |
| GE1102990 | 110 P |
| GRU1302990 | 130 P |
| GE1452990 | 145 P |
