The spinning internal core containing powerful permanent magnets.
A complete parts diagram and spare parts list for the Hilti SID 4-A22 Cordless Impact Driver can be found in its official Operating Instructions hilti+sid+4+a22+parts+diagram
If your bits are no longer locking into place, you can service the chuck assembly using basic tools. Control Switch & Speed Regulator Over time, the
: The locking sleeve and bit holder that takes most of the wear. Control Switch & Speed Regulator hilti+sid+4+a22+parts+diagram
Over time, the small ball bearing or the spring inside the quick-release chuck can wear down or become clogged with drywall dust and debris, causing bits to slip out.
An optional metal attachment that can be fastened to either side of the base for quick carrying on a tool pouch. Hilti SID 4-A22 Technical Specifications Reference