Wolfcraft North America - Brad-Point Bits Review
The Harbor Freight spade-shaped bit had mixed results in our tests, underperforming in its ability to clear chips as it cuts.The author tested eight brands of drill bits for the accuracy of their stated dimensions, the efficiency of their design, and their chip-clearing ability. The 3/8-in. bits were selected for the most rigorous tests, drilling 200 holes in hard maple and 875 in particleboard. The 3/16-in. bits were tested for clogging in pine; the 1/2-in. bits were tested on white oak. He found that the spade-shaped bits performed the worst, the W-shaped bits produced mixed results, and the spur-shaped bits were best overall.
The Harbor Freight spade-shaped bit clogged to the point that it stopped cutting, and the center point on the 3/8-in. bit was so far off center that the test board shook violently when the bit engaged the wood. It scored a good in entry-hole rating but poor in through-hole rating and chip clearing.
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