(32) Heavy Duty Rock Heads are designed for drilling holes in hard clays, shales, hardpan, sandstone, and root impregnated areas. The tool bodies are manufactured from chrom-moly tool steel, and the carbide cutting blades are made in the USA.
(16) Spade Rock Heads are manufactured from the finest tool stell and carbide available to create one aggressive, tough, long lasting and inexpensive drill bit. Conical carbide cutters are strategically positioned to aggressively drill through those nasty soils. The heat treated, abrasive resistant steel body is 3/4" thick and is hard faced on all major wear edges fro long life. Best used with a Lead Auger to remove millings.
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