DURABLE METAL MATERIAL: All-metal keyless chuck with three-claw design and spring, heat-treated for enhanced durability SIMPLE TO USE: Allows quick and easy accessory changes without the need to change collets WIDE RANGE OF APPLICATIONS: Compatible with DREMEL 9/32-40 thread; inner hole diameter 6.2mm; fits models 4000, 400, 3000, 398, 395, 300, 285, 275, 200, 100, 8200, 800, 780, 770, 7700, 750 NOTE: Not compatible with model 8050-N/18 due to short machine shaft, despite thread match Category: Electric grinder chuck Full length: 23.4mm Tooth width: tooth distance 0.75mm Clampable range: 0.4-3.2mm Chuck range: 0.4-3.4mm Length: 2.1cm, Diameter: 1.4cm Material: Steel Color: Black Package Contents: 4 x Keyless Chuck Only the above package content, other products are not included Note: Lighting and display differences may cause slight color variation between the image and actual item. Measurement may vary by +/- 1-3cm