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2 Piece set. Accurately starts, enlarge and deburrs in holes in material up to 1/2" thick. The 90° notch point starts holes easily. Each reamer has five hole-enlargement steps. Gold Oxide for low temperature stress relief that enhances lubricity, reduces friction and increases toughness. Type 78-GR. Made In USA.
Range: 5/16” – 9/16” Steps: 5 Step Increments: 1/2"