Mandril de pasador Starrett

I’ve been using it for jewelry assembly and the collet holds even the tiniest drill bits dead-center, which makes all the difference. The knurled grip gives you real control for fine work, and it feels solidly built for the price.

For jewelry work where a 0.5mm drill bit would vanish between my fingers, this thing holds it rock-solid—the chuck's grip is precise enough that I don't have to re-tighten mid-task. It's become my go-to for delicate assembly sessions.

The chuck grabs even the tiniest drill bits without slipping, and the balance feels just right when I’m setting stones. Made my last jewelry repair a lot less fiddly than usual.