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You can drilling length of the countersink drill bits set can be adjusted for various length screws simply by loosening and the screw. Specifications: 3mm 4mm 5mm 6mm 7mm 8mm 10mm (diameter of three-point woodworking drill) The three-Pointed design can quickly and accurately drill a smooth hole. And the five-edged chamfer design will fast discharge chips from the hole on both sides automatically. for drilling machines with chuck for drilling on hard wood or wooden floor. The countersink drill bits set are applicable to bench drill hand drill etc. Chamfer diameter: 15.8mm 1x Hex Key Material: high speed steel 4241 The countersink drill bits set have 3mm 4mm 5mm 6mm 7mm 8mm 10mm 7 x chamfer drill and 1 piece of hex key. High hardness good resistance durable. 1x 7 PCS Drill Bit Set Drill Bit Set make of Heat treated & tempered high-carbon steel with Titanium coating for superior cutting power. Maquina De Poleas Pa Tope Cazoleta Brocas Con Avellanador Para Metal Mesa De Trabajo Taller Profesional Sacabocados Para Metal Rajadora De Leña