Park Tool head and steerer tube cutting tools in sets. Features: SHIS standard is EC56 Combines reaming and facing of the head tube to create a perfect fit for most sizes of head cups Includes 30.1 mm reamer and four different size pilots (29.8mm, 30.0mm, 33.8mm, and 36.8mm) Will face frames of EC29, EC30, EC34, EC37 and will ream frames of EC30 Quick-release, quick-adjust feature: bottom portion slides off and on easily without threading