For fixing bottom bracket threads on the frame or removes excess paint or dirt from threads BSA standard - left & right thread tap 1.3/8 × 24 TPI Includes: Reamer’s magnetic handle 1695.1/4BI or 1695.1/4BIUS, Reamer holder for 1697.2/4, Left & right tap BSA 1.3/8 × 24 TPI 
