?DIMENSIONS: total size is 24X14mm, clamp range is 0.4-3.2mm ?RUSTPROOF, HIGH HARDNESS: This flexible chuck adapter is made of all metal and is extremely durable after high temperature heat treatment. The rust black oxide on the surface also increases its lifespan. CONVENIENT AND EASY TO USE: Allows you to change accessory bits quickly and easily. No need to change chuck when changing between sizes. WIDE RANGE OF APPLICATIONS: Applicable to original DREMEL 9/32-40 thread, 6.2mm direct inner hole, the model is 4000, 400,3000, 398, 395, 300, 285, 275, 200, 100, 8200, 800, 780, 770 , 7700, 750 ?REMAASDUE: 8050-N / 18 can not be used, the thread can be adapted, but the machine shaft is too short Product Description Specification: Weight: 0.1 kg Material: alloy Category: Mandrel Total length: 23.4mm Tooth width: 0.75mm tooth distance Clamping range: 0.4-3.2mm Clamping range: 0.4 - 3.4mm Length: 2.1cm, Diameter: 1.4cm Use with rotary tool models: 4000, 400, 3000, 398, 395, 300, 285, 275, 200, 100, 8220, 8200, 800, 780, 770, 7700 , 750 (RemaASDue: Make sure your Dremel rotary tool model is listed. ) Package Included: 2 x Keyless Chuck