This replacement blade fits easily, yet securely to the Hubbard Jointer. The Hubbard Jointer's distinctive design allows for one tool to create many different sizes of concave joints. This 5/8" blade connects to the cast aluminum handle, sold separately. Wear on the blade is distributed during use by simply revolving the tubular steel blade around the handle. Polished steel blade makes smooth grooves every time. This unique tool was designed by a longtime bricklayer.