Specifications: Unique step structure, a bit can open a variety of specifications and sizes of apertures, a step drill to a box of bits. It does not need to use central punch and is not easy to break compared with ordinary twist drills. In site construction, one step drill is suitable for various specifications. Deburring, chamfering, round hole reaming, can complete the function that twist drill can not complete. Comparing with ordinary twist drill, small shaking, no need to lead the use of center punch can also open a beautiful aperture out. Item Name: Core Drill Bit Material: High Speed Steel Surface Treatment: Titanium Plating Drilling Range: 3-13mm(3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13mm) Length: 8cm/3.15", Width: 1.2cm/0.47", Height: 1.2cm/0.47" (Approx.) Notes: Water injection cooling while working can effectively prolong the service life of drills. The recommended drilling speed is 250-400 rpm. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Core Drill Bit
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