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Trend Snappy 5 Piece Drill Countersink Set for Wood Screws

Heat treated tool steel countersinks and HSS drill bits. Adjustable for different length screws and can produce a 9.5mm (3/8 “) diameter or 12.7 mm (1/2”) diameter counterbored hole for woodplugs. Specifications
Shank: 1/4″ Hex