Handy, portable knife sharpener; Compact sharpening steel that lets you quickly and easily touch up the edge on your Kershaw anywhere, anytime; Handle is made of 6060-T6 anodized aircraft aluminum; Stored inside the handle is a 600-grit, diamond-coated oval shaft; Requires no water or oil; Lightweight and easy to use; To sharpen, hold the blade edge against the diamond-coated shaft at about a 20-degree angle and swipe the blade, from heel to tip, along the sharpening shaft; Limited Lifetime Warranty