Note:- since the link is a multi - attribute product, please pay attention to the title & description & then purchase. Choice available check title, mentioned in brackets at the end of the tit ideal for combined use with a hand drill or electric drill. Three - jaw head design, can be clamped 0.3-3.5mm range. Tail is brass, drill chuck is aluminum alloy, rugged and durable. Clamping range: 0.3-3.5mm material: brass & auminum alloy