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.
The 648L is an M47 x 1.0 left-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 drive side (right side) of the bike.
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