Park Tool Left Replacement Drill Bit

For cutting tool sharpening services, see Sharpening Services Park Tool. Always use a cutting fluid like Park Tool CF-2 when machining.

The 691 is a replacement tap for the BTS-1 bottom bracket tapping set in the right-hand thread standard of 1.370 "x 24 TPI. This tap is used on either the left or right side of the bike. This side of the bike drive uses a clockwise or right-hand thread.