The Slice 10491 auto-retractable metal-handle utility knife combines a sleek-but-sturdy metal handle with Slice's proprietary safety blade for a powerful, safe tool. Slice finger-friendly blades last up to 11. 2 times longer than steel blades and are safe to the touch. With on-board blade storage quick-open blade garage—and a tool-free blade change mechanism, This knife works as hard as you do. The installed 10524 rounded-tip blade retracts automatically when the slider is released, ensuring that the blade is never left exposed between jobs. The optional 10525 pointed-tip blade and 10523 serrated blade expand the possible applications for this ambidextrous safety knife.