ITEM NAME:Guitar Bass Battery Holder Cover Box 9Volt with Input Output Jack Black Description: Guitar Cylinder Flush Mount Output Jack Socket with 9V Battery Holder Case. Socket jack output socket in black. Tighter mouth reduce the noise of the guitar. Fitted for about 12mm diameter body. Replacement parts for guitar bass. Size Chart: Jack Size(L x W x H): Approx. 4.9*1.6*1.6cm/1.93x0.63x0.63inch Battery Box( L x W x H): 72.5x38.5x23mm/2.85x1.52x0.91 inch Package Includes: 1 Piece Cylinder Output Jack 1 Piece Battery Box SKU: MNF0022246219430226.Guitar Cylinder Flush Mount Output Jack Socket with 9V Battery Holder Case. Jewelry Findings |Health & Beauty |Wedding Decoration |Sports and Outdoors |Jewelry & Watches |Clothing, Shoes, Accessories |Other.