Proper frame preparation is very important. The Park #754 1-1/8" (33.8mm) Head Tube Reamer is designed to be used with the Park reamer handle. The 754 1-1/8" (33.8mm) Head Tube Reamer Only combines reaming and facing of the head tube to create a perfect fit for most sizes of head cups. There are cases when a reamer is required to clean out or increase the diameter of the head tube. Most times however, facing of the head tube for good cup fit is the objective. In this case, reaming is not necessary and the pilots can be used in place of the reamers to keep the tool straight and create a faced head tube. All cutting surfaces are top quality and extra sharp.