Cloth impregated silicone rubber washers have a really great breaking action between yokes and fixtures to act like a brake and allow not only easier positioning of the fixture but also helping to keep it in the new position as well. Sold by the piece but you will typically need two per fixture--sandwiched between one of our female yoke adapters (CL-Y250 or CL-Y3125) and your yoke. Made from silicone for a superior and long lasting washer. Specifications: Inner Hole diameter 1/4". Outer Washer Diameter: 1-1/16". Thickness 1/8". Color: black