Auto-loading bit chamber makes changing bits quick and easy. Gearless ratchet mechanism for precise tightening. On-board bit storage - 6 preloaded in the chamber, 4 additional bits in the handle. Great for computer repairs, electronics, home projects, or hobbies. Operation: to change bits, pull clear portion of handle back, rotate red bit chamber to desired size, and close handle. To change bits, remove unwanted bit from tip, pull handle back, replace desired bit from handle with removed bit.