Hubbard Jointer Company produces high quality masonry hand tools for the professional bricklayer and mason. Hubbard Sled Runners allow for complete versatility on the job. They are designed with interchangeable, replaceable, hardened tubular steel blades available in four diameters which can be exchanged to adapt to joint size requirements. Wear is distributed during use by simply revolving the tubular steel blade. Should a blade eventually wear out, it is removed and a replacement installed on the cast aluminum handle. The hardened tubular steel blades on the Sled Runners produce a uniform and consistently fine finish on the mortar.