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Klein Tools KTSB03 Step Drill Bit Double Fluted 3, 1/4 to 3/4-Inch with Easy-to-Read Markings and Targets, 3/8-Inch Hex Shank , Black : Amazon.co.uk: DIY & Tools
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Klein Tools 25960 Step Drill Bit, 7/8 to 1-3/8-Inch, Spiral Double-Fluted, Cut Thin Metal, Plastic, Aluminum, Wood, 1/4-Inch Hex Shank, VACO : Amazon.co.uk: DIY & Tools
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