The 647R is an M47 x 1.0 right-hand threaded tap designed for use with the BTS-1 Bottom Bracket Tapping Set to tap T47 bottom bracket shells. This tap is used on the non-drive side (left side) of the bike.
The 647L is an M47 x 1.0 left-hand threaded tap designed for use with the BTS-1 Bottom Bracket Tapping Set to tap T47 bottom bracket shells. This tap is used on the drive side (right side) of the bike.
NOTE: Always use cutting fluid such as Park Tool CF-2 when machining.
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