Shars keyless ball bearing drill chuck is specifically engineered for heavy-duty, tight tolerance production drilling Drill chuck designed for drilling applications on portable bench, floor type drill presses, mills, lathes & more Ball bearing construction improves gripping force ...Shars keyless ball bearing drill chuck is specifically engineered for heavy-duty, tight tolerance production drilling Drill chuck designed for drilling applications on portable bench, floor type drill presses, mills, lathes & more Ball bearing construction improves gripping force and drilling accuracy Hardened ground center jaw to improve absolute straightness alignment and durability A drill chuck wrench MUST be used to tighten the drill chuck to give it enough torque. Shars Tool is not responsible for any damage caused by drill bit slipping out of the drill chuck. Drill chuck wrench is NOT included with all models of the drill chuck sold by Shars Tool, please check online for details.
Self-tightening mechanism automatically increases the grip in proportion to the increase in torque during the drilling and avoids the tool slipping in a clockwise rotation