Electric drill (ELECTRIC DRILL) with appropriate drilling drilling General.Before the drill every time steel piling should be used to direct the Center drill to drill down, is the position.Should handle drilling machine, drilling firm and the points.The drill, to be correlated to the rotation. To ensure the safety of the user.In the drill, all types must have surpassed the material always supports the workpiece.Drills should be used, appropriate to the size of the work piece.Do not use the wrong class, such as drilling concrete drill bits should not be to penetrate steel.
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