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A mandrel is a precision-machined steel rod used to mount your wood blank—with the brass tube inserted—onto the lathe for turning. Unlike many other suppliers that only offer a single size, we provide two mandrel options to suit different project needs: Mandrel A (commonly known as 7mm) has a diameter of 0.247" (+0 / -0.002") and is ideal for slim pen kits. Mandrel B features a larger 0.291" (+0 / -0.002") diameter, which reduces flex and vibration (“whip”) during turning. This added stability makes it perfect for larger or more demanding pen designs.