Sendt 1/4 inch (6.3mm) Male to Male Mono Offset Effects Pedal Coupler All metal offset male to male coupler Mono male to mono male offset effects coupler Space efficient all metal offset effects pedal coupler. Great signal transmission. 1/4 inch (6.3 mm) male to 1/4 inch (6.3 mm) offset male coupler Great for connecting effects pedals that have input/output jacks that are at slightly different heights!