Jacobs Chuck - Mini Mandrel magnet They have a much thinner

They have a much thinner steel core

Chemical Composition: CaCO3

Tips & Tricks: Hand pads are gripped in the palm of one's hand with the work piece on top

its said that they gather all the negative energy- releasing it and relinquishing you from it as it breaks

but otherwise

Jacobs Chuck - Mini Mandrel magnet They have a much thinnerDescription: These mini chucks act as great alternatives for the dremel collet system. They can also be used to extend bits into hard to reach places. Made in: China Overall length: 52mmShaft diameter: 2. 3mm or 3mmThread length: 16. 7mmWeight: 8. 7g Chuck Range: 0. 3mm 3. 4mm Quantity: 1 full piece (1 mandrel and 1 chuck)