GT400 5/16" Carded Glass and Tile Bit:

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Item # Diameter Quantity
GT100 1/8" 1
GT200 3/16" 1
GT300 1/4" 1
GT500 3/8" 1
GT600 1/2" 1
GT700 5/8" 1
GT800 3/4" 1
GT900 7/8" 1
GT1000 1" 1