The Dremel Multi Chuck will accept the following Dremel drills:

Dremel 3000 Rotary Drill (997 6201, 999 3321 & 999 3366)

Dremel Micro Rotary 8050 Cordless Drill (999 3348)

Dremel 4000 (999 3202)

Dremel Flexible Shaft (999 3322)