Specifications and features: Kershaw Auto-Tek sharpener 600 grit, diamond impregnated steel Double injection molded Santoprene handle Black and gray finish Push button sharpening steel release 3-1/8" sharpening steel 8" overall length 4-1/2" closed 3.4 ounces Auto-Tek Retractable Diamond Knife Sharpener - Take hold of the Auto-Tek's handle, push the button, and instantly your sharpening steel deploys and is ready to put a perfect edge on any knife. The steel's fine, 600 grit diamond surface is ideal for sharpening and honing almost any knife. But it's the opening mechanism that will really give you a kick. Inspired by the quick action of a switchblade, a simple push up on the button automatically releases the steel from the handle, while a pullback automatically retracts it. The glass filled handle has soft touch over molding for a secure grip. Toss it in your pack or gear bag and you'll always have the tool you need to keep your knives sharp and on the job.