The 648R is an M47 x 1.0 right-hand threaded standard guide for use when facing bottom bracket shells with the BTS-1 Bottom Bracket Tapping and Facing Set or BFS-1 Bottom Bracket Facing Set. This guide is used on the non-drive side (left side) of the bike.

• M47 x 1.0 right-hand threading
• Sized for T47 bottom bracket shells
  

NOTE: Always use cutting fluid such as Park Tool CF-2 when machining.