Impact-resistant quick-action drill chuck with radial locking plastic sleeve. Optional with retaining ring for machines without spindle stop. SINGLE SLEEVE- is for power tools with spindle lock, meaning you can tighten and lock the drill bit in the chuck without the use of both hands. LOCKING RING - For tools without spindle lock and you tighten and lock the drill bit in the chuck by holding the locking ring and body to close it to clamp Features and Benefits: Keyless With plastic retaining ring With through-hole for use of a locking screw Easy clamping and locking with one manual operation Radial locking device to prevent release of the drill bit during clockwise and anticlockwise rotation Impact-resistant for universal use Carbide inserts in the clamping jaws Locking screw NOT INCLUDED