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 with no tools required. Compact durable design for long-lasting versatile use. Tools compatible with these attachments are Single Speed MultiPro Rotary Tool 275 Two speed MultiPro Rotary Tool Kit 2850-01 Variable Speed MultiPro Rotary Tool 395 Digital Rotary Tool Kit 3981 and 9.6 cordless MultiPro Rotary Tool Kit 7800-01.