Stacking Snap Adapter P/N: SNAPJACK The SCC STACKJACK connects a mat to a banana jack. Connect a wrist strap, ground cord, or constant monitor. Great for grounding mats on carts. STACKJACK has one banana jack, one 3/8 inch (10mm) male snap, and one 3/8 inch (10mm) female snap. Multiple STACKJACK's can be snapped together for more banana jacks. Fully covered in plastic, the STACKJACK does not allow exposed conductors like other stacking snap banana jacks.