Shaft lock on the attachment allows for easy accessory changes. Ball bearings and spiral bevel gears provide smooth and cool operation. Coupling system allows you to orient the attachment on your tool in 12 different directions. Quick connect system easily attaches to your rotary tool in place of the housing cap, no wrenches required. Compact, durable design for those "hard-to reach" places Includes the attachment and a drive adapter. Fits Dremel models 275, 285, 395 and 398.