avail Number of Blades: 6, 8, 12
avail Core Diameter (inch): 8 1/2"×4", 8 1/2"×4 1/8"
avail Models: GMC1306, GMC1308, GMC1312
Brand Great Drill Bit Co. Ltd.
avail Bit Sizes (inch): 6", 8 1/2"
avail Number of Blades: 8, 12
avail Cutting Structure Type: Standard, MicroCORE™
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