TMAX 2pc 4486 MultiPro Keyless Chuck for Dremel and Compatible Rotary Tools Keyless chuck for all standard size rotary tools and flexible hose shafts. Simplify and speed up your project. Now have tool-free accessory changes; Eliminate the need for collet and wrench when changing accessories Accepts all accessory rotary bits with 1/32" to 1/8" shanks; use with rotary tool models 4000, 400, 3000, 398, 395, 300, 285, 275, 200, 100, 8220, 8200, 8050, 800, 780, 770, 7700, 750 Also for Dremel attachments 212, 225, and 575 US-BASED CUSTOMER SERVICE: Available by chat, email, phone, or visit us at our customer service center in La Crosse, WI. TMAX 2 pc 4486 Multipro Keyless Chuck for Dremel Rotary Tools