TTC 18 Piece Tap & Drill Indexes & Sets SIZE 2.5mm x .45mm Tap, 2.05mm Drill; 4.0mm x .50mm Tap, 2.50mm Drill, 3.5mm x .60mmTap, 2.90mm Drill, 4.0mm x .70mm Tap, 3.30mm Drill, 5.0mm x .80mm Tap, 4.20mm Drill, 6.0mm x 1.00mm Tap, 3.30mm Drill, 5.0mm x .8
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