Set includes stop collars for controlling drill bit depth to a precise setting Six piece set includes stops for 3/16 Inch (4.8mm), 1/4 Inch (6.35mm), 5/16 Inch (7.9mm), 3/8 Inch (9.5mm), 7/16 Inch (11.1mm), and 1/2 Inch (12.7mm) diameter drill bits Includes allen wrench for tightening stops' set screws Steel stops for durable performance
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