Each IRWIN quick-change bit holder features a carbon-steel sleeve and body for durability The bit extension has a patented jaw design with 6-flatted shanks to hold bits securely These bit holders use the Lock-n-Load system for 1-handed quick release 5-1/2" overall length Each IRWIN quick-change bit holder features a carbon-steel sleeve and body for durability The bit extension has a patented jaw design with 6-flatted shanks to hold bits securely These bit holders use the Lock-n-Load system for 1-handed quick release 5-1/2" overall length