5/8-11 Thread Extension Shaft Set Electric Drill Conversion Collets Adapter Acce

【Precision Collet System】Includes ER16-1/8″, 1/4″, 3/8″, 1/2″ spring collets for secure gripping of drill bits. 【Easy to Install】Simply screw onto your grinder’s spindle and tighten the collet with a wrench.