Foto&Tech 5 Pieces Metal 1/4" to 3/8" Convert Screw Adapter for Tripod Monopod Ballhead DSLR SLR 1/4" to 3/8" Convert Screw Adapter Thread Adapter with female 1/4" thread to male 3/8" thread Compatible to Lens Plate Button Heads, Arca Swiss Type Button Heads Fit as well as original reducer Made of metal, solid and durable