Do not buy this product. The quality and accuracy of the product is terrible. According to the description it has a 1/4 inch shank. However, it wasn't working in my router profile, so I put my micrometer on it. As you can see in the bottom half of the image, the actual shaft size is 15/64. Customs service. So no 1/4" collet can grip this bit. The top half of the picture is another nozzle from another manufacturer that actually has a 1/4" shank. I won't be buying anything from this seller/manufacturer again. With router bits and cnc bit precision everything. So if they can't get it right I doubt the cutter head will be right either.