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1/4-20 UNC Straight Flute Tap Left Hand and 5.1mm Drill Bit Set Titanium Plated | eBay
1/4-20 UNC H2 Straight Flute Tap 5mm Drill Bit High Speed Steel Tap & Bit Set | eBay
Amazon.com: 6-Piece 1/4-20NC Combination Drill Tap Bit Set SAE, Made of High-Speed Steel with Anti-Rust Blackened Coating, Ideal for Soft Metal, Wood & Plastic, 1/4” UNC-20 Thread Size, 1/4” Hex Shank :
Milwaukee SHOCKWAVE 1/4-20 UNC Steel Impact Rated Drill Tap Bit 48-89-4873 - The Home Depot
Titan USA - Combination Drill Tap: 1/4-20, H3, 2B, 2 Flutes, High Speed Steel - 07960784 - MSC Industrial Supply
DEWALT 1/4-in-20 2-Flute Hss Drill Tap with Drill Bit in the Taps department at Lowes.com
Dubro Products 364 1/4-20 Tap & Drill Bit Sets | eBay
TEMO 2 pc 1/4-20 Combination Drill and Tap Multi Use Bit – GoldenCoulee.com