The double ended park tool hcw 18 bottom bracket wrench spanner fits slotted adjusting cones found on some one piece cranks the opposite end fits three notched fixed cones on some one piece cranks park tool hcw 18 bottom bracket wrench features the double ended hcw 18 spanner fits slotted adjusting cones found on some one piece cranks the opposite end fits three notched fixed cones on some one piece cranks made in the usa and covered by park tool39s legendary li