QUICK-RELEASE DEVICE FOR SCREWDRIVER BITS

A quick-release device for screwdriver bit (40) includes a shank (10) having a polygonal hole (11) longitudinally defined in one end thereof and adapted for partially receiving a bit (40). At least one slot (13) is longitudinally defined in the shank (10). An annular groove (14) is defined in an inner periphery of the polygonal hole (11) and communicates with the at least one slot (13), wherein the annular groove (14) is formed with a tapered section (15) toward the first end of the shank (10). An expandable limit element (16) is received in the annular groove (14). A sleeve (20) is movably sleeved on the shank (10). The sleeve (20) has at least one protrusion (21) inwardly extending therefrom and engaged into the at least one slot (13) and abutting against the limit element (16) when removing the bit (40) form the polygonal hole (11). A stopper (30) is secured on one end of the shank (10) for preventing the sleeve (20) from removing from the shank (10).