Torque transferring device for use with a power tool

A torque transferring device for a power tool, comprising a first portion comprising a first engaging structure arranged at a front end of said first portion and adapted to engage a corresponding mating structure to transfer torque thereto, and a second portion comprising a second engaging structure for connection to an output shaft of a power tool arranged at a rear end portion of said second portion, wherein said second portion comprises an open cavity adapted to receive said output shaft of a power tool,

• said device further comprising a pin arranged at least partly in said open cavity, wherein said pin is arranged to extend in an axial direction and further arranged to, in use, engage a hole formed in said power tool output shaft, wherein said pin comprises a body portion and a head portion, wherein said head portion is adapted to, in use, extend into said hole formed in said power tool output shaft.