OPERATE: Push in accessory to insert, pull out sleeve to release It is ideal for close-up drilling in micro-production or the medical industry. DESIGN: Designed for the most exact, fine-detailed drilling jobs, this specially-machined 3-jawchuck fits in standard chucks to securely hold the smallest drill bits. MATERIAL: Made of quality material, durable and easy to use. USAGE: The Chuck Quick Change Adapter can be used on hex drive power tools. USING: Easily the locks and releases drill bits, quickly convert your quick change hex shank driver unto a drill. Description: Net Weight: Approx.7g. Color: Black. Size: Approx.0.75mm. Main Material: Alloy. Note: 1.1 Inch=2.45cm/1cm0.393inch 2.Please allow 1-3 cm error due to manual measurement. Pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Including 1SET(2PCS) Mini 3 Jaw Drill Chuck