Made of stainless steel, these chucks maintain smooth, precise operation even when exposed to moisture and chemicals. They’re keyed, so their jaw locks securely around bits—use the included key to tighten and loosen their hold. Thanks to their grip, they’re great for high-torque, low-speed drilling in hard materials. Mount them to Jacobs taper arbors on equipment ranging from handheld drills to drill presses.

A through hole allows long bits to pass through without hitting the back of the chuck. They can also be used on an electrical discharge machine to hold electrodes and let fluid pass through.

To maximize grip and minimize runout, choose a chuck where your drill bit diameter falls in the middle of the bit shank size range.