The ideal accessory for your Festool Domino® 500 Q Joiner! The Domino Self-Centering Guide lets you change stop positions quickly and easily on your Domino without tools or measuring! A steel coupling cable keeps both stops always centered around the Domino mortise location. Infinitely adjustable from 3/4'' to 5-1/4''. Machined from aviation grade billet aluminum, with a hard anodized finish for protection. Detent positions for the stop arm's up and down positions are controlled with micro ball plungers with stainless steel balls.