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A screw with a diameter of 1/4 Inch can be used. (Hole depth:7mm) 20mm YAMAHA CORPORATION MODEL NS-AP1400S MADE IN CHINA Secure installation is the purchaser's responsibility. When using speaker bracket to mount the speakers on a wall or ceiling, it is strongly recommended that safety wire, which may be included the bracket, be used between the speaker and the bracket to prevent the speaker from falling.