Castleford 5 Piece Multi-Fit Tobacco Pipe Reamer Tool, Model: (Tools & Outdoor gear supplies) Any pipe must have the bowl reamed periodically to prevent carbon build-up Choose from four different-size cutting reamers to fit your pipe bowl Each size is based upon common bowl dimensions for best fit Includes 17mm, 19mm, 21mm, and 23mm reamers with steel blades Hardened plastic T-handle and custom fitted storage box