Reduces the cost of squeegee rubber and silicon squeegee blades by 93%. This ingenious device not only cuts your expenses, it makes you more efficient too. The Docket increases your earning power by giving you a sharp, straight edge anytime you need it. A sharp edge glides over glass more easily and cleans windows streak free. Docket allows you to trim your squeegee blades to perfection up to twelve times. Groves in the Sörbo channel let you reposition the blade every time you sharpen, so the rubber blade maintains correct firmness.